(c) 2005-2009 Hajo Rijgersberg, Jan Top, Mari Wigham, Agrotechnology and Food Sciences Group, Wageningen University and Research Centre, The Netherlands. This document is available under Create Common Licence. You are free to Share — to copy, distribute, display, and perform the work and to Remix — to make derivative works; under the condition of Attribution: You must attribute the work in the manner specified by the author or licensor (but not in any way that suggests that they endorse you or your use of the work). The publisher does not accept any liability for the inaccuracies in this document. unit of measure unit of measurement unit singular unit abampere The abampere is a unit of electric current defined as 10 ampere. abA abcoulomb The abcoulomb is a unit of electric charge defined as 10 coulomb. abC abfarad The abfarad is a unit of capacitance defined as 1.0e9 farad. abF abhenry The abhenry is a unit of inductance defined as 1.0e-9 henry. abH abmho absiemens The abmho is a unit of electrical conductance defined as 1.0e9 siemens. abohm The abohm is a unit of electrical resistance defined as 1.0e-9 ohm. abΩ abvolt The abvolt is a unit of electric potential defined as 1.0e-8 volt. abV acre The acre is a unit of area defined as 4.046873e3 square metre. acre foot The acre foot is a unit of volume defined as 1.233489e3 cubic metre. ampere The ampere is a unit of electric current defined as the constant current that produces an attractive force of 2e–7 newton per metre of length between two straight, parallel conductors of infinite length and negligible circular cross section placed one metre apart in a vacuum. The ampere is a unit of electric current defined as the constant current that produces an attractive force of 2e–7 newton per metre of length between two straight, parallel conductors of infinite length and negligible circular cross section placed one metre apart in a vacuum. The ampere is a base unit in the International System of Units. A amylase unit The amylase unit is a unit of catalytic activity. AU U ångström The ångström is a unit of length defined as 0.1 metre. Å are The are is a unit of area defined as 100 square metre. a astronomical unit The atronomical unit is a unit of length defined as 1.495979e11 metre. AU au atmosphere (standard) standard atmosphere atmosphere The standard atmosphere is a unit of pressure defined as 1.01325e5 pascal. atm atmosphere (technical) technical atmosphere atmosphere The technical atmosphere is a unit of pressure defined as 9.80665e4 pascal. at bar The bar is a unit of pressure defined as 100 000 pascal. bar barn The barn is a unit of area defined as 1.0e-28 square metre. b barrel The barrel is a unit of volume defined as 1.589873e-1 cubic metre. bbl barye The barye is a unit of pressure defined as 0.1 pascal. ba becquerel The becquerel is a unit of activity defined as the activity of a quantity of radioactive material in which one nucleus decays per second. Algebraically it is defined as 1 divided by second. The becquerel is a unit of activity defined as the activity of a quantity of radioactive material in which one nucleus decays per second. Algebraically it is defined as 1 divided by second. The becquerel is a derived unit in the International System of Units. Bq biot The biot is a unit of electric current defined as 10 ampere. Bi British thermal unit (39 °F) 39 °F British thermal unit British thermal unit The 39 °F British thermal unit is a unit of energy defined as 1.05967e3 joule. Btu British thermal unit (59 °F) 59 °F British thermal unit British thermal unit The 59 °F British thermal unit is a unit of energy defined as 1.05480e3 joule. Btu British thermal unit (60 °F) 60 °F British thermal unit British thermal unit The 60 °F British thermal unit is a unit of energy defined as 1.05468e3 joule. Btu British thermal unit (International Table) International Table British thermal unit British thermal unit The International Table British thermal unit is a unit of energy defined as 1.055056e3 joule. BtuIT British thermal unit (mean) mean British thermal unit British thermal unit The mean British thermal unit is a unit of energy defined as 1.05587e3 joule. Btu British thermal unit (thermochemical) thermochemical British thermal unit British thermal unit The thermochemical British thermal unit is a unit of energy defined as 1.054350e3 joule. Btuth bushel The bushel is a unit of volume defined as 3.523907e-2 cubic metre. bu calorie (15 °C) 15 °C calorie calorie The 15 °C calorie is a unit of energy defined as 4.18580 joule. cal15 calorie (20 °C) 20 °C calorie calorie The 20 °C calorie is a unit of energy defined as 4.18190 joule. cal20 calorie (International Table) calorie (International Steam Table) International Table calorie International Steam Table calorie calorie The International Table calorie is a unit of energy defined as 4.1868 joule. calIT calorie (mean) mean calorie calorie The mean calorie is a unit of energy defined as 4.19002 joule. cal c calorie (thermochemical) thermochemical calorie calorie The thermochemical calorie is a unit of energy defined as 4.184 joule. calth candela The candela is a unit of luminous intensity defined as the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540e12 hertz and that has a radiant intensity in that direction of 1/683 watt per steradian. The candela is a unit of luminous intensity defined as the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540e12 hertz and that has a radiant intensity in that direction of 1/683 watt per steradian. The candela is a base unit in the International System of Units. cd carat (mass) carat The carat (mass) is a unit of mass defined as 2.0e-4 kilogram. chain The chain is a unit of length defined as 2.011684e1 metre. ch cicero The cicero is a unit of length defined as 12 point (Didot). circular mil The cicular mil is a unit of area defined as 5.067075e-10 square metre. cord The cord is a unit of volume defined as 3.624556 cubic metre. coulomb The coulomb is a unit of electric charge defined as ampere times second = farad times volt. The coulomb is a unit of electric charge defined as ampere times second = farad times volt. The coulomb is a derived unit in the International System of Units. C cup The cup is a unit of volume defined as 2.365882e-4 cubic metre. curie The curie is a unit of activity defined as 3.7e10 becquerel. Ci day The day is a unit of time defined as 86400 second. d day (sidereal) sidereal day The sidereal day is a unit of time defined as 8.616409e4 second. degree The degree is a unit of plane angle defined as 1.745329e-2 radian. ° degree Celsius centigrade The degree Celsius is a unit of temperature defined as 1 kelvin. The degree Celsius is a unit of temperature defined as 1 kelvin. The degree Celsius is a derived unit in the International System of Units. °C degree Fahrenheit The degree Fahrenheit is a unit of temperature defined as 5.555556e-1 kelvin. °F degree Rankine The degree Rankine is a unit of temperature defined as 5.555556e-1 kelvin. °R °Ra degree Réaumur The degree Réaumur is a unit of temperature defined as 1.25 kelvin. °Ré °Re °R dry gallon (US) gallon (US dry) US dry gallon dry gallon gallon The US dry gallon is a unit of volume defined as 4.40488377086e-3 cubic metre. gal dry pint (US) pint (US dry) US dry pint dry pint pint The US dry pint is a unit of volume defined as 5.506105e-4 cubic metre. dry pt dry quart (US) quart (US dry) US dry quart dry quart quart The US dry quart is a unit of volume defined as 1.101221e-3 cubic metre. dry qt dyne The dyne is a unit of force defined as 1.0e-5 newton. dyn electronvolt The electronvolt is a unit of energy defined as 1.602177e-19 joule. eV erg The erg is a unit of energy defined as 1.0e-7 joule. erg farad The farad is a unit of capacitance defined as ampere times second divided by volt = coulomb divided by volt = coulomb squared divided by joule = coulomb squared divided by newton times metre = second squared times coulomb squared divided by square metre times kilogram = second to the power 4 times ampere squared divided by square metre times kilogram. The farad is a unit of capacitance defined as ampere times second divided by volt = coulomb divided by volt = coulomb squared divided by joule = coulomb squared divided by newton times metre = second squared times coulomb squared divided by square metre times kilogram = second to the power 4 times ampere squared divided by square metre times kilogram. The farad is a derived unit in the International System of Units. F faraday The faraday is a unit of electric charge defined as 9.648531e4 coulomb. fathom The fathom is a unit of length defined as 1.828804 metre. fermi The fermi is a unit of length defined as 1.0e-15 metre. fluid ounce (Imperial) ounce (Imperial fluid) Imperial fluid ounce fluid ounce ounce The Imperial fluid ounce is a unit of volume defined as 2.841306e-5 cubic metre. fl oz fluid ounce (US) ounce (US fluid) US fluid ounce fluid ounce ounce The US fluid ounce is a unit of volume defined as 2.957353e-5 cubic metre. fl oz foot The foot is a unit of foot defined as 3.048e-1 metre. ft foot (US survey) US survey foot foot The US survey foot is a unit of length defined as 3.048006e-1 metre. ft foot poundal The foot poundal is a unit of energy defined as 4.214011e-2 joule. footcandle The footcandle is a unit of illuminance defined as 1.076391e1 lux. footlambert The footlambert is a unit of luminance defined as 3.426259 candela per square metre. franklin The franklin is a unit of electric charge defined as 3.335641e-10 coulomb. Fr furlong The furlong is a unit of length defined as 201.168 metre. gal galileo The gal is a unit of acceleration defined as centimetre per second (time) squared. Gal gallon (Imperial) Imperial gallon gallon The Imperial gallon is a unit of volume defined as 4.54609e-3 cubic metre. gal gallon (US) US gallon gallon The US gallon is a unit of volume defined as 3.785412e-3 cubic metre. gal gamma The gamma is a unit of magnetic flux density defined as 1.0e-9 tesla. γ gauss abtesla The gauss is a unit of magnetic flux density defined as 1.0e-4 tesla. G Gs gilbert The gilbert is a unit of electric current defined as 7.957747e-1 ampere. Gi gill (Imperial) Imperial gill gill The Imperial gill is a unit of volume defined as 1.420653e-4 cubic metre. gi gill (US) US gill gill The US gill is a unit of volume defined as 1.182941e-4 cubic metre. gi gon grade The gon is a unit of plane angle defined as 1.570796e-2 radian. gon grain The grain is a unit of mass defined as 6.479891e-5 kilogram. gr gram The gram is a unit of mass defined as 1.0e-3 kilogram. g gray The gray is a unit of absorbed dose defined as joule divided by kilogram = square metre divided by second squared. The gray is a unit of absorbed dose defined as joule divided by kilogram = square metre divided by second squared. The gray is a derived unit is the International System of Units. Gy henry The henry is a unit of inductance defined as square metre times kilogram divided by second squared times ampere squared = weber divided by ampere = volt second divided by ampere = (joule divided by coulomb) times second divided by (coulomb divided by second) = joule times second squared divided by coulomb squared = square metre times kilogram divided by coulomb squared. The henry is a unit of inductance defined as square metre times kilogram divided by second squared times ampere squared = weber divided by ampere = volt second divided by ampere = (joule divided by coulomb) times second divided by (coulomb divided by second) = joule times second squared divided by coulomb squared = square metre times kilogram divided by coulomb squared. The henry is a derived unit in the International System of Units. H hertz The hertz is a unit of frequency defined as 1 divided by second. The hertz is a unit of frequency defined as 1 divided by second. The hertz is a derived unit in the International System of Units. Hz horsepower (boiler) boiler horsepower horsepower The boiler horsepower is a unit of power defined as 9.80950e3 watt. horsepower (British) British horsepower Imperial horsepower horsepower The British horsepower is a unit of power defined as 7.4570e2 watt. horsepower (electric) electric horsepower horsepower The electric horsepower is a unit of power defined as 7.46e2 watt. horsepower (metric) metric horsepower horsepower The metric horsepower is a unit of power defined as 7.354988e2 watt. PS horsepower (water) water horsepower horsepower The water horsepower is a unit of power defined as 7.46043e2 watt. hour The hour is a unit of time defined as 3600 second. h hour (sidereal) sidereal hour hour hundredweight (British) British hundredweight hundredweight The British hundredweight is a unit of mass defined as 5.080235e1 kilogram. hundredweight (US) US hundredweight hundredweight The US hundredweight is a unit of mass defined as 4.535924e1 kilogram. inch The inch is a unit of length defined as 2.54e-2 metre. in joule The joule is a unit of energy defined as kilogram times square metre divided by second squared. The joule is a unit of energy defined as kilogram times square metre divided by second squared. The joule is a derived unit in the International System of Units. J katal The katal is a unit of catalytic activity defined as mole divided by second. The katal is a unit of catalytic activity defined as mole divided by second. The katal is a derived unit in the International System of Units. kat kayser rydberg The kayser is a unit of wave number defined as 100 reciprocal metre. kelvin The kelvin is a unit of temperature defined as 1/273.16 of the thermodynamic temperature of the triple point of water. The kelvin is a unit of temperature defined as 1/273.16 of the thermodynamic temperature of the triple point of water. The kelvin is a base unit in the International System of Units. K kip The kip is a unit of force defined as 4.448222e3 newton. knot The knot is a unit of speed defined as nautical mile per hour. lambert The lambert is a unit of luminance defined as 3.183099e3 candela per square metre. light year The light year is a unit of length defined as 9.46073e15 metre. ly liquid pint (US) pint (US liquid) US liquid pint liquid pint pint The US liquid pint is a unit of volume defined as 4.731765e-4 cubic metre. liq pt liquid quart (US) quart (US liquid) US liquid quart liquid quart quart The US liquid quart is a unit of volume defined as 9.463529e-4 cubic metre. liq qt litre liter The litre is a unit of volume defined as 1.0e-3 cubic metre. l L lumen The lumen is a unit of luminous flux defined as candela times steradian = lux times square metre. The lumen is a unit of luminous flux defined as candela times steradian = lux times square metre. The lumen is a derived unit in the International System of Units. lm lux The lux is a unit of illuminance defined as lumen divided by square metre = candela times steradian divided by square metre. The lux is a unit of illuminance defined as lumen divided by square metre = candela times steradian divided by square metre. The lux is a derived unit in the International System of Units. lx maxwell The maxwell is a unit of magnetic flux defined as 1.0e-8 weber. Mx metre meter The metre is a unit of length is defined as the length of the path travelled by light in vacuum during a time interval of 1/299 792 458 of a second. The metre is a unit of length defined as the length of the path travelled by light in vacuum during a time interval of 1/299 792 458 of a second. The metre is a base unit in the International System of Units. m mho The mho is a unit of electrical conductance defined as 1 siemens. micron The micron is a unit of length defined as 1.0e-6 metre. μ mil (length) mil thou The mil (length) is a unit of length defined as 2.54e-5 metre. mil (plane angle) mil (angle) mil The mil (plane angle) is a unit of plane angle defined as 9.817477e-4 radian. mile (US survey) US survey mile mile The US survey mile is a unit of length defined as 1.609347e3 metre. minute (plane angle) minute (angle) minute of arc arcminute minute The minute (plane angle) is a unit of plane angle defined as 2.908882e-4 radian. ' minute (time; sidereal) minute (sidereal) sidereal minute minute The sidereal minute is a unit of time defined as 5.983617e1 second. minute (time) minute The minute (time) is a unit of time defined as 60 second. min mole The mole is a unit of amount of substance defined as the amount of substance of a system that contains as many elementary entities as there are atoms in 0.012 kilogram of carbon 12. The mole is a unit of amount of substance defined as the amount of substance of a system that contains as many elementary entities as there are atoms in 0.012 kilogram of carbon 12. The mole is a base unit in the International System of Units. mol nautical mile The nautical mile is a unit of length defined as 1852 metre. nmi M NM nm newton The newton is a unit of force defined as kilogram timesmetre divided by second squared. The newton is a unit of force defined as kilogram times metre divided by second squared. The newton is a derived unit in the International System of Units. N oersted The oersted is a unit of magnetic field defined as 7.957747e1 ampere per metre. Oe ohm The ohm is a unit of electrical resistance defined as volt divided by ampere = square metre times kilogram divided by second to the power 3 times ampere squared. The ohm is a unit of electrical resistance defined as volt divided by ampere = square metre times kilogram divided by second to the power 3 times ampere squared. The ohm is a derived unit in the International System of Units. Ω one unit one Unit one is a unit of dimension one. 1 ounce (apothecaries') apothecaries' ounce troy ounce ounce (troy) ounce The apothecaries' ounce is a unit of mass defined as 3.110348e-2 kilogram. oz (ap.) oz (apoth) ounce (avoirdupois) avoirdupois ounce ounce The avoirdupois ounce is a unit of mass defined as 2.834952e-2 kilogram. oz oz (av.) oz avdp parsec The parsec is a unit of length defined as 3.08567802e16 metre. pc pascal The pascal is a unit of pressure and stress defined as newton divided by square metre = joule divided by cubic metre = kilogram divided by metre second squared. The pascal is a unit of pressure and stress defined as newton divided by square metre = joule divided by cubic metre = kilogram divided by metre second squared. The pascal is a derived unit in the International System of Units. Pa peck The peck is a unit of volume defined as 8.809768e-3 cubic metre. pk pennyweight The pennyweight is a unit of mass defined as 1.555174e-3 kilogram. dwt phot The phot is a unit of illuminance defined as 1.0e4 lux. ph pica (ATA) ATA pica pica The ATA pica is a unit of length defined as 12 point (ATA). pica (Postscript) Postscript pica pica The Postscript pica is a unit of length defined as 12 point (Postscript). pica (TeX) TeX pica pica The TeX pica is a unit of length defined as 12 point (TeX). pint (Imperial) Imperial pint pint The pint is a unit of volume defined as 568.26125 millilitre. point (ATA) ATA point point The ATA point is a unit of length defined as 0.3514598e-3 metre. pt point (Didot) Didot point point The Didot point is a unit of length defined as 0.3759e-3 metre. pt point (Postscript) Postscript point point The Postscript point is a unit of length defined as 0.013888888888888888888888888888889 inch. pt point (TeX) TeX point point The TeX point is a unit of length defined as 0.01383700013837000138370001383 inch. pt poise The poise is a unit of dynamic viscosity defined as 1.0e-1 pascal second (time). P pound (apthecaries') apothecaries' pound troy pound pound (troy) pound The apothecaries' pound is a unit of mass defined as 3.732417e-1 kilogram. lb pound (avoirdupois) avoirdupois pound pound The avoirdupois pound is a unit of mass defined as 4.535924e-1 kilogram. lb pound-force pound The pound-force is a unit of force defined as 4.448222 newton. lbf poundal The poundal is a unit of force defined as 1.382550e-1 newton. quad The quad is a unit of energy defined as 1.0e15 British thermal unit (International Table). quart (Imperial) Imperial quart quart The Imperial quart is a unit of volume defined as 1.1365 litre. rad The rad is a unit of absorbed dose defined as 1.0e-2 gray. rad radian The radian is a unit of plane angle defined as the plane angle subtended at the center of a circle by an arc that is equal in length to the radius of the circle. The radian is a unit of plane angle defined as the plane angle subtended at the center of a circle by an arc that is equal in length to the radius of the circle. The radian is a derived unit in the International System of Units. rad rem The rem is a unit of dose equivalent defined as 1.0e-2 sievert. rem revolution The revolution is a unit of plane angle defined as 6.283185 radian. r rod perch pole The rod is a unit of length defined as 5.029210 metre. rd röntgen The röntgen is a unit of exposure to x and γ rays defined as 2.58e-4 coulomb per kilogram. R second (plane angle) second (angle) second of arc arcsecond second The second (plane angle) is a unit of plane angle defined as 4.848137e-6 radian. " second (time; sidereal) second (sidereal) sidereal second second (sidereal) second The sidereal second is a unit of time defined as 9.972696e-1 second. s second (time) second The second is a unit of time defined as the duration of 9 192 631 770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the cesium 133 atom. The second is a unit of time defined as the duration of 9 192 631 770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the cesium 133 atom. The second is a base unit in the International System of Units. s shake The shake is a unit of time defined as 1.0e-8 second. siemens The siemens is a unit of electrical conductance defined as 1 divided by ohm = ampere divided by volt = coulomb squared times second divided by kilogram times square metre = ampere squared times second to the power 3 divided by kilogram times square metre. The siemens is a unit of electrical conductance defined as 1 divided by ohm = ampere divided by volt = coulomb squared times second divided by kilogram times square metre = ampere squared times second to the power 3 divided by kilogram times square metre. The siemens is a derived unit in the International System of Units. S sievert The sievert is a unit of dose equivalent defined as joule divided by kilogram = square metre divided by second squared. The sievert is a unit of dose equivalent defined as joule divided by kilogram = square metre divided by second squared. The sievert is a derived unit is the International System of Units. Sv slug The slug is a unit of mass defined as 1.459390e1 kilogram. slug statampere The statampere is a unit of electric current defined as 3.335641e-10 ampere. statA statcoulomb The statcoulomb is a unit of electric charge defined as 3.335641e-10 coulomb. statC statfarad The statfarad is a unit of capacitance defined as 1.112650e-12 farad. statF stathenry The stathenry is a unit of inductance defined as 8.987552e11 henry. statH statmho statsiemens The statmho is a unit of electrical conductance defined as 1.112650e-12 siemens. statohm The statohm is a unit of electrical resistance defined as 8.987552e11 ohm. statΩ stattesla The stattesla is a unit of magnetic flux density defined as 2.9979e6 tesla. statT mile (statute) statute mile mile The statute mile is a unit of length defined as 1.609344e3 metre. mi statvolt The statvolt is a unit of electric potential defined as 2.997925e2 volt. statV statweber The statweber is a unit of magnetic flux defined as 2.9979e2 weber. statWb steradian The steradian is a unit of solid angle defined as the solid angle subtended at the center of a sphere by a portion of the surface of the sphere that has an area equal to the square of the radius of the sphere. The steradian is a unit of solid angle defined as the solid angle subtended at the center of a sphere by a portion of the surface of the sphere that has an area equal to the square of the radius of the sphere. The steradian is a derived unit in the International System of Units. sr stere The stere is a unit of volume defined as cubic metre. stilb The stilb is a unit of luminance defined as 1.0e4 candela per square metre. sb tablespoon The tablespoon is a unit of volume defined as 1.478676e-5 cubic metre. teaspoon The teaspoon is a unit of volume defined as 4.928922e-6 cubic metre. tesla The tesla is a unit of magentic flux density defined as volt times second divided by square metre = newton divided by ampere times metre = weber divided by square metre = kilogram divided by coulomb times second = kilogram divided by ampere times second squared. The tesla is a unit of magentic flux density defined as volt times second divided by square metre = newton divided by ampere times metre = weber divided by square metre = kilogram divided by coulomb times second = kilogram divided by ampere times second squared. The tesla is a derived unit in the International System of Units. T therm (EC) EC therm therm The EC therm is a unit of energy defined as 1.05506e8 joule. therm (US) US therm therm The US therm is a unit of energy defined as 1.054804e8 joule. ton (assay) assay ton ton The assay ton is a unit of mass defined as 2.916667e-2 kilogram. ton-force The ton-force is a unit of force defined as 8.896443e3 newton. ton (long) long ton ton The long ton is a unit of mass defined as 1.016047e3 kilogram. ton (register) register ton ton The register ton is a unit of volume defined as 2.831658 cubic metre. ton (short) short ton ton The short ton is a unit of mass defined as 9.071847e2 kilogram. ton of refridgeration The ton of refridgeration is a unit of power defined as 3.516853e3 watt. ton of TNT The ton of TNT is a unit of energy defined as 4.184e9 joule. tonne metric ton The tonne is a unit of mass defined as 1000 kilogram. t torr The torr is a unit of pressure defined as 1.333224e2 pascal. Torr unified atomic mass unit The unified atomic mass unit is a unit of mass defined as 1.660538782(83)e−27 kilogram. u unit pole The unit pole is a unit of magnetic flux defined as 1.256637e-7 weber. volt The volt is a unit of electric potential defined as watt divided by ampere = joule divided by coulomb = newton times metre divided by ampere times second = kilogram times square metre divided by ampere times second to the power 3. The volt is a unit of electric potential defined as watt divided by ampere = joule divided by coulomb = newton times metre divided by ampere times second = kilogram times square metre divided by ampere times second to the power 3. The volt is a derived unit in the International System of Units. V watt The watt is a unit of power defined as joule divided by second = newton times metre divided by second = volt times ampere = kilogram times square metre divided by second to the power 3. The watt is a unit of power defined as joule divided by second = newton times metre divided by second = volt times ampere = kilogram times square metre divided by second to the power 3. The watt is a derived unit in the International System of Units. W weber The weber is a unit of magnetic flux defined as kilogram times square metre divided by second squared times ampere = volt times second = joule divided by ampere. The weber is a unit of magnetic flux defined as kilogram times square metre divided by second squared times ampere = volt times second = joule divided by ampere. The weber is a derived unit in the International System of Units. Wb yard The yard is a unit of length defined as 9.144e-1 metre. yd year The year is a unit of time defined as 3.1536e7 second. a y yr year (sidereal) sidereal year year The sidereal year is a unit of time defined as 3.155815e7 second. year (tropical) tropical year year The tropical year is a unit of time defined as 3.155693e7 second. unit multiple or submultiple yoctoampere The yoctoampere is a unit of electric current defined as 1.0e-24 ampere. yA zeptoampere The zeptampere is a unit of electric current defined as 1.0e-21 ampere. zA attoampere The attoampere is a unit of electric current defined as 1.0e-18 ampere. aA femtoampere The femtoampere is a unit of electric current defined as 1.0e-15 ampere. fA picoampere The picoampere is a unit of electric current defined as 1.0e-12 ampere. pA nanoampere The nanoampere is a unit of electric current defined as 1.0e-9 ampere. nA microampere The microampere is a unit of electric current defined as 1.0e-6 ampere. μA milliampere The milliampere is a unit of electric current defined as 1.0e-3 ampere. mA centiampere The centiampere is a unit of electric current defined as 1.0e-2 ampere. cA deciampere The deciampere is a unit of electric current defined as 1.0e-1 ampere. dA decaampere The decaampere is a unit of electric current defined as 1.0e1 ampere. daA hectoampere The hectoampere is a unit of electric current defined as 1.0e2 ampere. hA kiloampere The kiloampere is a unit of electric current defined as 1.0e3 ampere. kA megaampere The megaampere is a unit of electric current defined as 1.0e6 ampere. MA gigaampere The gigaampere is a unit of electric current defined as 1.0e9 ampere. GA teraampere The teraampere is a unit of electric current defined as 1.0e12 ampere. TA petaampere The petaampere is a unit of electric current defined as 1.0e15 ampere. PA exaampere The exaampere is a unit of electric current defined as 1.0e18 ampere. EA zettaampere The zettaampere is a unit of electric current defined as 1.0e21 ampere. ZA yottaampere The yottaampere is a unit of electric current defined as 1.0e24 ampere. YA centiare The centiare is a unit of area defined as 1.0e-2 are. ca hectare The hectare is a unit of area defined as 1.0e2 are. ha microbar The microbar is a unit of pressure defined as 1.0e-6 bar. μbar millibar The millibar is a unit of pressure defined as 1.0e-3 bar. mbar decibar The decibar is a unit of pressure defined as 1.0e-1 bar. dbar yoctobecquerel The yoctobecquerel is a unit of activity defined as 1.0e-24 becquerel. yBq zeptobecquerel The zeptbecquerel is a unit of activity defined as 1.0e-21 becquerel. zBq attobecquerel The attobecquerel is a unit of activity defined as 1.0e-18 becquerel. aBq femtobecquerel The femtobecquerel is a unit of activity defined as 1.0e-15 becquerel. fBq picobecquerel The picobecquerel is a unit of activity defined as 1.0e-12 becquerel. pBq nanobecquerel The nanobecquerel is a unit of activity defined as 1.0e-9 becquerel. nBq microbecquerel The microbecquerel is a unit of activity defined as 1.0e-6 becquerel. μBq millibecquerel The millibecquerel is a unit of activity defined as 1.0e-3 becquerel. mBq centibecquerel The centibecquerel is a unit of activity defined as 1.0e-2 becquerel. cBq decibecquerel The decibecquerel is a unit of activity defined as 1.0e-1 becquerel. dBq decabecquerel The decabecquerel is a unit of activity defined as 1.0e1 becquerel. daBq hectobecquerel The hectobecquerel is a unit of activity defined as 1.0e2 becquerel. hBq kilobecquerel The kilobecquerel is a unit of activity defined as 1.0e3 becquerel. kBq megabecquerel The megabecquerel is a unit of activity defined as 1.0e6 becquerel. MBq gigabecquerel The gigabecquerel is a unit of activity defined as 1.0e9 becquerel. GBq terabecquerel The terabecquerel is a unit of activity defined as 1.0e12 becquerel. TBq petabecquerel The petabecquerel is a unit of activity defined as 1.0e15 becquerel. PBq exabecquerel The exabecquerel is a unit of activity defined as 1.0e18 becquerel. EBq zettabecquerel The zettabecquerel is a unit of activity defined as 1.0e21 becquerel. ZBq yottabecquerel The yottabecquerel is a unit of activity defined as 1.0e24 becquerel. YBq kilocalorie (mean) kilocalorie The kilocalorie (mean) is a unit of energy defined as 1.0e3 calorie (mean). kcal yoctocandela The yoctocandela is a unit of luminous intensity defined as 1.0e-24 candela. ycd zeptocandela The zeptcandela is a unit of luminous intensity defined as 1.0e-21 candela. zcd attocandela The attocandela is a unit of luminous intensity defined as 1.0e-18 candela. acd femtocandela The femtocandela is a unit of luminous intensity defined as 1.0e-15 candela. fcd picocandela The picocandela is a unit of luminous intensity defined as 1.0e-12 candela. pcd nanocandela The nanocandela is a unit of luminous intensity defined as 1.0e-9 candela. ncd microcandela The microcandela is a unit of luminous intensity defined as 1.0e-6 candela. μcd millicandela The millicandela is a unit of luminous intensity defined as 1.0e-3 candela. mcd centicandela The centicandela is a unit of luminous intensity defined as 1.0e-2 candela. ccd decicandela The decicandela is a unit of luminous intensity defined as 1.0e-1 candela. dcd decacandela The decacandela is a unit of luminous intensity defined as 1.0e1 candela. dacd hectocandela The hectocandela is a unit of luminous intensity defined as 1.0e2 candela. hcd kilocandela The kilocandela is a unit of luminous intensity defined as 1.0e3 candela. kcd megacandela The megacandela is a unit of luminous intensity defined as 1.0e6 candela. Mcd gigacandela The gigacandela is a unit of luminous intensity defined as 1.0e9 candela. Gcd teracandela The teracandela is a unit of luminous intensity defined as 1.0e12 candela. Tcd petacandela The petacandela is a unit of luminous intensity defined as 1.0e15 candela. Pcd exacandela The exacandela is a unit of luminous intensity defined as 1.0e18 candela. Ecd zettacandela The zettacandela is a unit of luminous intensity defined as 1.0e21 candela. Zcd yottacandela The yottacandela is a unit of luminous intensity defined as 1.0e24 candela. Ycd yoctocoulomb The yoctocoulomb is a unit of electric charge defined as 1.0e-24 coulomb. yC zeptocoulomb The zeptcoulomb is a unit of electric charge defined as 1.0e-21 coulomb. zC attocoulomb The attocoulomb is a unit of electric charge defined as 1.0e-18 coulomb. aC femtocoulomb The femtocoulomb is a unit of electric charge defined as 1.0e-15 coulomb. fC picocoulomb The picocoulomb is a unit of electric charge defined as 1.0e-12 coulomb. pC nanocoulomb The nanocoulomb is a unit of electric charge defined as 1.0e-9 coulomb. nC microcoulomb The microcoulomb is a unit of electric charge defined as 1.0e-6 coulomb. μC millicoulomb The millicoulomb is a unit of electric charge defined as 1.0e-3 coulomb. mC centicoulomb The centicoulomb is a unit of electric charge defined as 1.0e-2 coulomb. cC decicoulomb The decicoulomb is a unit of electric charge defined as 1.0e-1 coulomb. dC decacoulomb The decacoulomb is a unit of electric charge defined as 1.0e1 coulomb. daC hectocoulomb The hectocoulomb is a unit of electric charge defined as 1.0e2 coulomb. hC kilocoulomb The kilocoulomb is a unit of electric charge defined as 1.0e3 coulomb. kC megacoulomb The megacoulomb is a unit of electric charge defined as 1.0e6 coulomb. MC gigacoulomb The gigacoulomb is a unit of electric charge defined as 1.0e9 coulomb. GC teracoulomb The teracoulomb is a unit of electric charge defined as 1.0e12 coulomb. TC petacoulomb The petacoulomb is a unit of electric charge defined as 1.0e15 coulomb. PC exacoulomb The exacoulomb is a unit of electric charge defined as 1.0e18 coulomb. EC zettacoulomb The zettacoulomb is a unit of electric charge defined as 1.0e21 coulomb. ZC yottacoulomb The yottacoulomb is a unit of electric charge defined as 1.0e24 coulomb. YC yoctodegree Celsius The yoctodegree Celsius is a unit of temperature defined as 1.0e-24 degree Celsius. y°C zeptodegree Celsius The zeptdegree Celsius is a unit of temperature defined as 1.0e-21 degree Celsius. z°C attodegree Celsius The attodegree Celsius is a unit of temperature defined as 1.0e-18 degree Celsius. a°C femtodegree Celsius The femtodegree Celsius is a unit of temperature defined as 1.0e-15 degree Celsius. f°C picodegree Celsius The picodegree Celsius is a unit of temperature defined as 1.0e-12 degree Celsius. p°C nanodegree Celsius The nanodegree Celsius is a unit of temperature defined as 1.0e-9 degree Celsius. n°C microdegree Celsius The microdegree Celsius is a unit of temperature defined as 1.0e-6 degree Celsius. μ°C millidegree Celsius The millidegree Celsius is a unit of temperature defined as 1.0e-3 degree Celsius. m°C centidegree Celsius The centidegree Celsius is a unit of temperature defined as 1.0e-2 degree Celsius. c°C decidegree Celsius The decidegree Celsius is a unit of temperature defined as 1.0e-1 degree Celsius. d°C megaelectronvolt The megaelectronvolt is a unit of energy defined as 1.0e6 electronvolt. MeV megaerg megalerg The megaerg is a unit of energy defined as 1.0e6 erg. Merg yoctofarad The yoctofarad is a unit of capacitance defined as 1.0e-24 farad. yF zeptofarad The zeptfarad is a unit of capacitance defined as 1.0e-21 farad. zF attofarad The attofarad is a unit of capacitance defined as 1.0e-18 farad. aF femtofarad The femtofarad is a unit of capacitance defined as 1.0e-15 farad. fF picofarad The picofarad is a unit of capacitance defined as 1.0e-12 farad. pF nanofarad The nanofarad is a unit of capacitance defined as 1.0e-9 farad. nF microfarad The microfarad is a unit of capacitance defined as 1.0e-6 farad. μF millifarad The millifarad is a unit of capacitance defined as 1.0e-3 farad. mF centifarad The centifarad is a unit of capacitance defined as 1.0e-2 farad. cF decifarad The decifarad is a unit of capacitance defined as 1.0e-1 farad. dF decafarad The decafarad is a unit of capacitance defined as 1.0e1 farad. daF hectofarad The hectofarad is a unit of capacitance defined as 1.0e2 farad. hF kilofarad The kilofarad is a unit of capacitance defined as 1.0e3 farad. kF megafarad The megafarad is a unit of capacitance defined as 1.0e6 farad. MF gigafarad The gigafarad is a unit of capacitance defined as 1.0e9 farad. GF terafarad The terafarad is a unit of capacitance defined as 1.0e12 farad. TF petafarad The petafarad is a unit of capacitance defined as 1.0e15 farad. PF exafarad The exafarad is a unit of capacitance defined as 1.0e18 farad. EF zettafarad The zettafarad is a unit of capacitance defined as 1.0e21 farad. ZF yottafarad The yottafarad is a unit of capacitance defined as 1.0e24 farad. YF milligauss The milligauss is a unit of magnetic flux density defined as 1.0e-3 gauss. mG yoctogram The yoctogram is a unit of mass defined as 1.0e-24 gram. yg zeptogram The zeptgram is a unit of mass defined as 1.0e-21 gram. zg attogram The attogram is a unit of mass defined as 1.0e-18 gram. ag femtogram The femtogram is a unit of mass defined as 1.0e-15 gram. fg picogram The picogram is a unit of mass defined as 1.0e-12 gram. pg nanogram The nanogram is a unit of mass defined as 1.0e-9 gram. ng microgram The microgram is a unit of mass defined as 1.0e-6 gram. μg milligram The milligram is a unit of mass defined as 1.0e-3 gram. mg centigram The centigram is a unit of mass defined as 1.0e-2 gram. cg decigram The decigram is a unit of mass defined as 1.0e-1 gram. dg decagram The decagram is a unit of mass defined as 1.0e1 gram. dag hectogram The hectogram is a unit of mass defined as 1.0e2 gram. hg kilogram The kilogram is a unit of mass defined as the mass of the international prototype of the kilogram. The kilogram is a unit of mass defined as the mass of the international prototype of the kilogram. The kilogram is a base unit in the International System of Units. kg megagram The megagram is a unit of mass defined as 1.0e6 gram. Mg gigagram The gigagram is a unit of mass defined as 1.0e9 gram. Gg teragram The teragram is a unit of mass defined as 1.0e12 gram. Tg petagram The petagram is a unit of mass defined as 1.0e15 gram. Pg exagram The exagram is a unit of mass defined as 1.0e18 gram. Eg zettagram The zettagram is a unit of mass defined as 1.0e21 gram. ZG yottagram The yottagram is a unit of mass defined as 1.0e24 gram. YG yoctogray The yoctogray is a unit of absorbed dose defined as 1.0e-24 gray. yGy zeptogray The zeptgray is a unit of absorbed dose defined as 1.0e-21 gray. zGy attogray The attogray is a unit of absorbed dose defined as 1.0e-18 gray. aGy femtogray The femtogray is a unit of absorbed dose defined as 1.0e-15 gray. fGy picogray The picogray is a unit of absorbed dose defined as 1.0e-12 gray. pGy nanogray The nanogray is a unit of absorbed dose defined as 1.0e-9 gray. nGy microgray The microgray is a unit of absorbed dose defined as 1.0e-6 gray. μGy milligray The milligray is a unit of absorbed dose defined as 1.0e-3 gray. mGy centigray The centigray is a unit of absorbed dose defined as 1.0e-2 gray. cGy decigray The decigray is a unit of absorbed dose defined as 1.0e-1 gray. dGy decagray The decagray is a unit of absorbed dose defined as 1.0e1 gray. daGy hectogray The hectogray is a unit of absorbed dose defined as 1.0e2 gray. hGy kilogray The kilogray is a unit of absorbed dose defined as 1.0e3 gray. kGy megagray The megagray is a unit of absorbed dose defined as 1.0e6 gray. MGy gigagray The gigagray is a unit of absorbed dose defined as 1.0e9 gray. GGy teragray The teragray is a unit of absorbed dose defined as 1.0e12 gray. TGy petagray The petagray is a unit of absorbed dose defined as 1.0e15 gray. PGy exagray The exagray is a unit of absorbed dose defined as 1.0e18 gray. EGy zettagray The zettagray is a unit of absorbed dose defined as 1.0e21 gray. ZGy yottagray The yottagray is a unit of absorbed dose defined as 1.0e24 gray. YGy yoctohenry The yoctohenry is a unit of inductance defined as 1.0e-24 henry. yH zeptohenry The zepthenry is a unit of inductance defined as 1.0e-21 henry. zH attohenry The attohenry is a unit of inductance defined as 1.0e-18 henry. aH femtohenry The femtohenry is a unit of inductance defined as 1.0e-15 henry. fH picohenry The picohenry is a unit of inductance defined as 1.0e-12 henry. pH nanohenry The nanohenry is a unit of inductance defined as 1.0e-9 henry. nH microhenry The microhenry is a unit of inductance defined as 1.0e-6 henry. μH millihenry The millihenry is a unit of inductance defined as 1.0e-3 henry. mH centihenry The centihenry is a unit of inductance defined as 1.0e-2 henry. cH decihenry The decihenry is a unit of inductance defined as 1.0e-1 henry. dH decahenry The decahenry is a unit of inductance defined as 1.0e1 henry. daH hectohenry The hectohenry is a unit of inductance defined as 1.0e2 henry. hH kilohenry The kilohenry is a unit of inductance defined as 1.0e3 henry. kH megahenry The megahenry is a unit of inductance defined as 1.0e6 henry. MH gigahenry The gigahenry is a unit of inductance defined as 1.0e9 henry. GH terahenry The terahenry is a unit of inductance defined as 1.0e12 henry. TH petahenry The petahenry is a unit of inductance defined as 1.0e15 henry. PH exahenry The exahenry is a unit of inductance defined as 1.0e18 henry. EH zettahenry The zettahenry is a unit of inductance defined as 1.0e21 henry. ZH yottahenry The yottahenry is a unit of inductance defined as 1.0e24 henry. YH yoctohertz The yoctohertz is a unit of frequency defined as 1.0e-24 hertz. yHz zeptohertz The zepthertz is a unit of frequency defined as 1.0e-21 hertz. zHz attohertz The attohertz is a unit of frequency defined as 1.0e-18 hertz. aHz femtohertz The femtohertz is a unit of frequency defined as 1.0e-15 hertz. fHz picohertz The picohertz is a unit of frequency defined as 1.0e-12 hertz. pHz nanohertz The nanohertz is a unit of frequency defined as 1.0e-9 hertz. nHz microhertz The microhertz is a unit of frequency defined as 1.0e-6 hertz. μHz millihertz The millihertz is a unit of frequency defined as 1.0e-3 hertz. mHz centihertz The centihertz is a unit of frequency defined as 1.0e-2 hertz. cHz decihertz The decihertz is a unit of frequency defined as 1.0e-1 hertz. dHz decahertz The decahertz is a unit of frequency defined as 1.0e1 hertz. daHz hectohertz The hectohertz is a unit of frequency defined as 1.0e2 hertz. hHz kilohertz The kilohertz is a unit of frequency defined as 1.0e3 hertz. kHz megahertz The megahertz is a unit of frequency defined as 1.0e6 hertz. MHz gigahertz The gigahertz is a unit of frequency defined as 1.0e9 hertz. GHz terahertz The terahertz is a unit of frequency defined as 1.0e12 hertz. THz petahertz The petahertz is a unit of frequency defined as 1.0e15 hertz. PHz exahertz The exahertz is a unit of frequency defined as 1.0e18 hertz. EHz zettahertz The zettahertz is a unit of frequency defined as 1.0e21 hertz. ZHz yottahertz The yottahertz is a unit of frequency defined as 1.0e24 hertz. YHz yoctojoule The yoctojoule is a unit of energy defined as 1.0e-24 joule. yJ zeptojoule The zeptjoule is a unit of energy defined as 1.0e-21 joule. zJ attojoule The attojoule is a unit of energy defined as 1.0e-18 joule. aJ femtojoule The femtojoule is a unit of energy defined as 1.0e-15 joule. fJ picojoule The picojoule is a unit of energy defined as 1.0e-12 joule. pJ nanojoule The nanojoule is a unit of energy defined as 1.0e-9 joule. nJ microjoule The microjoule is a unit of energy defined as 1.0e-6 joule. μJ millijoule The millijoule is a unit of energy defined as 1.0e-3 joule. mJ centijoule The centijoule is a unit of energy defined as 1.0e-2 joule. cJ decijoule The decijoule is a unit of energy defined as 1.0e-1 joule. dJ decajoule The decajoule is a unit of energy defined as 1.0e1 joule. daJ hectojoule The hectojoule is a unit of energy defined as 1.0e2 joule. hJ kilojoule The kilojoule is a unit of energy defined as 1.0e3 joule. kJ megajoule The megajoule is a unit of energy defined as 1.0e6 joule. MJ gigajoule The gigajoule is a unit of energy defined as 1.0e9 joule. GJ terajoule The terajoule is a unit of energy defined as 1.0e12 joule. TJ petajoule The petajoule is a unit of energy defined as 1.0e15 joule. PJ exajoule The exajoule is a unit of energy defined as 1.0e18 joule. EJ zettajoule The zettajoule is a unit of energy defined as 1.0e21 joule. ZJ yottajoule The yottajoule is a unit of energy defined as 1.0e24 joule. YJ yoctokatal The yoctokatal is a unit of catalytic activity defined as 1.0e-24 katal. ykat zeptokatal The zeptkatal is a unit of catalytic activity defined as 1.0e-21 katal. zkat attokatal The attokatal is a unit of catalytic activity defined as 1.0e-18 katal. akat femtokatal The femtokatal is a unit of catalytic activity defined as 1.0e-15 katal. fkat picokatal The picokatal is a unit of catalytic activity defined as 1.0e-12 katal. pkat nanokatal The nanokatal is a unit of catalytic activity defined as 1.0e-9 katal. nkat microkatal The microkatal is a unit of catalytic activity defined as 1.0e-6 katal. μkat millikatal The millikatal is a unit of catalytic activity defined as 1.0e-3 katal. mkat centikatal The centikatal is a unit of catalytic activity defined as 1.0e-2 katal. ckat decikatal The decikatal is a unit of catalytic activity defined as 1.0e-1 katal. dkat decakatal The decakatal is a unit of catalytic activity defined as 1.0e1 katal. dakat hectokatal The hectokatal is a unit of catalytic activity defined as 1.0e2 katal. hkat kilokatal The kilokatal is a unit of catalytic activity defined as 1.0e3 katal. kkat megakatal The megakatal is a unit of catalytic activity defined as 1.0e6 katal. Mkat gigakatal The gigakatal is a unit of catalytic activity defined as 1.0e9 katal. Gkat terakatal The terakatal is a unit of catalytic activity defined as 1.0e12 katal. Tkat petakatal The petakatal is a unit of catalytic activity defined as 1.0e15 katal. Pkat exakatal The exakatal is a unit of catalytic activity defined as 1.0e18 katal. Ekat zettakatal The zettakatal is a unit of catalytic activity defined as 1.0e21 katal. Zkat yottakatal The yottakatal is a unit of catalytic activity defined as 1.0e24 katal. Ykat yoctokelvin The yoctokelvin is a unit of temperature defined as 1.0e-24 kelvin. yK zeptokelvin The zeptkelvin is a unit of temperature defined as 1.0e-21 kelvin. zK attokelvin The attokelvin is a unit of temperature defined as 1.0e-18 kelvin. aK femtokelvin The femtokelvin is a unit of temperature defined as 1.0e-15 kelvin. fK picokelvin The picokelvin is a unit of temperature defined as 1.0e-12 kelvin. pK nanokelvin The nanokelvin is a unit of temperature defined as 1.0e-9 kelvin. nK microkelvin The microkelvin is a unit of temperature defined as 1.0e-6 kelvin. μK millikelvin The millikelvin is a unit of temperature defined as 1.0e-3 kelvin. mK centikelvin The centikelvin is a unit of temperature defined as 1.0e-2 kelvin. cK decikelvin The decikelvin is a unit of temperature defined as 1.0e-1 kelvin. dK yoctolitre yl zeptolitre zl attolitre al femtolitre fl picolitre pl nanolitre nl microlitre μl millilitre ml centilitre cl decilitre dl decalitre dal hectolitre hl kilolitre kl megalitre Ml gigalitre Gl teralitre Tl petalitre Pl exalitre El zettalitre Zl yottalitre Yl yoctolumen ylm zeptolumen zlm attolumen alm femtolumen flm picolumen plm nanolumen nlm microlumen μlm millilumen mlm centilumen clm decilumen dlm decalumen dalm hectolumen hlm kilolumen klm megalumen Mlm gigalumen Glm teralumen Tlm petalumen Plm exalumen Elm zettalumen Zlm yottalumen Ylm yoctolux ycd zeptolux zcd attolux acd femtolux fcd picolux pcd nanolux ncd microlux μcd millilux mcd centilux ccd decilux dcd decalux dacd hectolux hcd kilolux kcd megalux Mcd gigalux Gcd teralux Tcd petalux Pcd exalux Ecd zettalux Zcd yottalux Ycd yoctometre ym zeptometre zm attometre am femtometre fm picometre pm nanometre nm micrometre μm millimetre mm centimetre cm decimetre dm decametre dam hetometre hm kilometre km megametre Mm gigametre Gm terametre Tm petametre Pm exametre Em zettametre Zm yottametre Ym yoctomole ymol zeptomole zmol attomole amol femtomole fmol picomole pmol nanomole nmol micromole μmol millimole mmol centimole cmol decimole dmol decamole damol hectomole hmol kilomole kmol megamole Mmol gigamole Gmol teramole Tmol petamole Pmol examole Emol zettamole Zmol yottamole Ymol yoctonewton yN zeptonewton zN attonewton aN femtonewton fN piconewton pN nanonewton nN micronewton μN millinewton mN centinewton cN decinewton dN decanewton daN hectonewton hN kilonewton kN meganewton MN giganewton GN teranewton TN petanewton PN exanewton EN zettanewton ZN yottanewton YN yoctoohm yΩ zeptoohm zΩ attoohm aΩ femtoohm fΩ picoohm pΩ nanoohm nΩ microohm μΩ milliohm mΩ centiohm cΩ deciohm dΩ decaohm daΩ hectoohm hΩ kilohm kiloohm kΩ megohm megaohm MΩ gigaohm GΩ teraohm TΩ petaohm PΩ exaohm EΩ zettaohm ZΩ yottaohm YΩ yoctopascal yPa zeptopascal zPa attopascal aPa femtopascal fPa picopascal pPa nanopascal nPa micropascal μPa millipascal mPa centipascal cPa decipascal dPa decapascal daPa hectopascal hPa kilopascal kPa megapascal MPa gigapascal GPa terapascal TPa petapascal PPa exapascal EPa zettapascal ZPa yottapascal YPa centipoise cP yoctoradian yrad zeptoradian zrad attoradian arad femtoradian frad picoradian prad nanoradian nrad microradian μrad milliradian mrad centiradian crad deciradian drad yoctosecond-time ys zeptosecond-time zs attosecond-time as femtosecond-time fs picosecond-time ps nanosecond-time ns microsecond-time μs millisecond-time ms centisecond-time cs decisecond-time ds decasecond-time das hectosecond-time hs kilosecond-time ks megasecond-time Ms gigasecond-time Gs terasecond-time Ts petasecond-time Ps exasecond-time Es zettasecond-time Zs yottasecond-time Ys yoctosiemens yS zeptosiemens zS attosiemens aS femtosiemens fS picosiemens pS nanosiemens nS microsiemens μS millisiemens mS centisiemens cS decisiemens dS decasiemens daS hectosiemens hS kilosiemens kS megasiemens MS gigasiemens GS terasiemens TS petasiemens PS exasiemens ES zettasiemens ZS yottasiemens YS yoctosievert ySv zeptosievert zSv attosievert aSv femtosievert fSv picosievert pSv nanosievert nSv microsievert μSv millisievert mSv centisievert cSv decisievert dSv decasievert daSv hectosievert hSv kilosievert kSv megasievert MSv gigasievert GSv terasievert TSv petasievert PSv exasievert ESv zettasievert ZSv yottasievert YSv yoctosteradian ysr zeptosteradian zsr attosteradian asr femtosteradian fsr picosteradian psr nanosteradian nsr microsteradian μsr millisteradian msr centisteradian csr decisteradian dsr yoctotesla yT zeptotesla zT attotesla aT femtotesla fT picotesla pT nanotesla nT microtesla μT millitesla mT centitesla cT decitesla dT decatesla daT hectotesla hT kilotesla kT megatesla MT gigatesla GT teratesla TT petatesla PT exatesla ET zettatesla ZT yottatesla YT kilotonne kt nanounified atomic mass unit nu yoctovolt yV zeptovolt zV attovolt aV femtovolt fV picovolt pV nanovolt nV microvolt μV millivolt mV centivolt cV decivolt dV decavolt daV hectovolt hV kilovolt kV megavolt MV gigavolt GV teravolt TV petavolt PV exavolt EV zettavolt ZV yottavolt YV yoctowatt yW zeptowatt zW attowatt aW femtowatt fW picowatt pW nanowatt nW microwatt μW milliwatt mW centiwatt cW deciwatt dW decawatt daW hectowatt hW kilowatt kW megawatt MW gigawatt GW terawatt TW petawatt PW exawatt EW zettawatt ZW yottawatt YW yoctoweber yWb zeptoweber zWb attoweber aWb femtoweber fWb picoweber pWb nanoweber nWb microweber μWb milliweber mWb centiweber cWb deciweber dWb decaweber daWb hectoweber hWb kiloweber kWb megaweber MWb gigaweber GWb teraweber TWb petaweber PWb exaweber EWb zettaweber ZWb yottaweber YWb compound unit unit multiplication candela steradian cd sr cd·sr kelvin mole K mol K·mol metre kelvin m K m·K newton metre N m N·m pascal second (time) Pa s Pa·s reciprocal metre kilogram second (time) to the power -2 m-1 kg s-2 m-1·kg·s-2 second (time) ampere s A s·A square metre steradian m2 sr m2·sr volt second (time) V s V·s kilowatt hour kilowatt-hour kilowatthour kW h kW·h kWh unit exponentiation cubic yoctometre ym3 3 cubic zeptometre zm3 3 cubic attometre am3 3 cubic femtometre fm3 3 cubic picometre pm3 3 cubic nanometre nm3 3 cubic micrometre μm3 3 cubic millimetre mm3 3 cubic centimetre cm3 3 cubic decimetre dm3 3 cubic metre Cubic metre is a unit of volume defined as the volume of a cube whose sides measure exactly one metre. Cubic metre is a unit of volume defined as the volume of a cube whose sides measure exactly one metre. Cubic metre is a derived unit in the International System of Units. m3 3 cubic decametre dam3 3 cubic hectometre hm3 3 cubic kilometre km3 3 cubic megametre Mm3 3 cubic gigametre Gm3 3 cubic terametre Tm3 3 cubic petametre Pm3 3 cubic exametre Em3 3 cubic zettametre Zm3 3 cubic yottametre Ym3 3 degree squared °2 2 reciprocal metre Reciprocal metre is a unit of wave number defined as 1 divided by metre. Reciprocal metre is a unit of wave number defined as 1 divided by metre. Reciprocal metre is a derived unit in the International System of Units. m-1 -1 reciprocal second (time) s-1 -1 yoctosecond (time) squared ys2 2 zeptosecond (time) squared zs2 2 attosecond (time) squared as2 2 femtosecond (time) squared fs2 2 picosecond (time) squared ps2 2 nanosecond (time) squared ns2 2 microsecond (time) squared μs2 2 millisecond (time) squared ms2 2 centisecond (time) squared cs2 2 decisecond (time) squared ds2 2 second (time) squared s2 2 decasecond (time) squared das2 2 hectosecond (time) squared hs2 2 kilosecond (time) squared ks2 2 megasecond (time) squared Ms2 2 gigasecond (time) squared Gs2 2 terasecond (time) squared Ts2 2 petasecond (time) squared Ps2 2 exasecond (time) squared Es2 2 zettasecond (time) squared Zs2 2 yottasecond (time) squared Ys2 2 square yoctometre ym2 2 square zeptometre zm2 2 square attometre am2 2 square femtometre fm2 2 square picometre pm2 2 square nanometre nm2 2 square micrometre μm2 2 square millimetre mm2 2 square centimetre cm2 2 square decimetre dm2 2 square metre Square metre is a unit of area defined as the area of a square whose sides measure exactly one metre. Square metre is a unit of area defined as the area of a square whose sides measure exactly one metre. Square metre is a derived unit in the International System of Units. m2 2 square decametre dam2 2 square hectometre hm2 2 square kilometre km2 2 square megametre Mm2 2 square gigametre Gm2 2 square terametre Tm2 2 square petametre Pm2 2 square exametre Em2 2 square zettametre Zm2 2 square yottametre Ym2 2 unit division ampere per metre Ampere per metre is a unit of magnetic field defined as ampere divided by metre. Ampere per metre is a unit of magnetic field defined as ampere divided by metre. Ampere per metre is a derived unit in the International System of Units. A/m A m−1 A·m−1 ampere per square metre Ampere per square metre is a unit of current density defined as ampere divided by square metre. Ampere per square metre is a unit of current density defined as ampere divided by square metre. Ampere per square metre is a derived unit in the International System of Units. A/m2 A m−2 A·m−2 ampere per volt A/V A V−1 A·V−1 candela per square centimetre cd/cm cd cm−1 cd·cm−1 candela per square metre Candela per square metre is a unit of luminance defined as candela divided by square metre. Candela per square metre is a unit of luminance defined as candela divided by square metre. Candela per square metre is a derived unit in the Internationa; System of Units. cd/m cd m−1 cd·m−1 coulomb per cubic metre C/m3 C m−3 C·m−3 coulomb per kilogram C/kg C kg−1 C·kg−1 coulomb per square metre C/m2 C m−2 C·m−2 coulomb per volt C/V C V−1 C·V−1 cubic metre per kilogram Cubic metre per kilogram is a unit of specific volume defined as cubic metre divided by kilogram. Cubic metre per kilogram is a unit of specific volume defined as cubic metre divided by kilogram. Cubic metre per kilogram is a derived unit in the International System of Units. m3/kg m3 kg−1 m3·kg−1 farad per metre F/m F m−1 F·m−1 kilogram per cubic metre Kilogram per cubic metre is a unit of density defined as kilogram divided by cubic metre. Kilogram per cubic metre is a unit of density defined as kilogram divided by cubic metre. Kilogram per cubic metre is a derived unit in the International System of Units. kg/m3 kg m−3 kg·m−3 gray per second (time) Gy/s Gy s−1 Gy·s−1 henry per metre H/m H m−1 H·m−1 joule per cubic metre J/m3 J m−3 J·m−3 joule per kilogram J/kg J kg−1 J·kg−1 joule per kelvin J/K J K−1 J·K−1 joule per kelvin kilogram J/K kg J/K·kg J K-1 kg−1 J·K−1·kg-1 joule per kelvin mole J/K mol J/K·mol J K−1 mol-1 J·K−1·mol-1 joule per mole J/mol J mol−1 J·mol−1 joule per second (time) J/s J s−1 J·s−1 lumen per square metre lm/m2 lm m−2 lm·m−2 metre kilogram per second (time) squared m kg/s2 m·kg/s2 m kg s-2 m·kg·s-2 kilometre per hour Kilometre per hour is a unit of speed defined as kilometre divided by hour. km/h km h−1 km·h−1 metre per metre m/m m m−1 m·m−1 metre per second (time) Metre per second is a unit of speed defined as metre divided by second. Metre per second is a unit of speed defined as metre divided by second. Metre per second is a derived unit in the International System of Units. m/s m s−1 m·s−1 mps yoctometre per second (time) Yoctometre per second is a unit of speed defined as yoctometre divided by second. ym/s ym s−1 ym·s−1 zeptometre per second (time) Zeptometre per second is a unit of speed defined as zeptometre divided by second. zm/s zm s−1 zm·s−1 attometre per second (time) Attometre per second is a unit of speed defined as attometre divided by second. am/s am s−1 am·s−1 femtometre per second (time) Femtometre per second is a unit of speed defined as femtometre divided by second. fm/s fm s−1 fm·s−1 picometre per second (time) Picometre per second is a unit of speed defined as picometre divided by second. pm/s pm·s−1 pm s−1 nanometre per second (time) Nanometre per second is a unit of speed defined as nanometre divided by second. nm/s nm s−1 nm·s−1 micrometre per second (time) Micrometre per second is a unit of speed defined as micrometre divided by second. μm/s μm·s−1 μm s−1 millimetre per second (time) Millimetre per second is a unit of speed defined as millimetre divided by second. mm/s mm s−1 mm·s−1 centimetre per second (time) Centimetre per second is a unit of speed defined as centimetre divided by second. cm/s cm s−1 cm·s−1 decimetre per second (time) Decimetre per second is a unit of speed defined as decimetre divided by second. dm/s dm s−1 dm·s−1 decametre per second (time) Decametre per second is a unit of speed defined as decametre divided by second. dam/s dam s−1 dam·s−1 hectometre per second (time) Hectometre per second is a unit of speed defined as hectometre divided by second. hm/s hm s−1 hm·s−1 kilometre per second (time) Kilometre per second is a unit of speed defined as kilometre divided by second. km/s km s−1 km·s−1 megametre per second (time) Megametre per second is a unit of speed defined as megametre divided by second. Mm/s Mm s−1 Mm·s−1 gigametre per second (time) Gigametre per second is a unit of speed defined as gigametre divided by second. Gm/s Gm s−1 Gm·s−1 terametre per second (time) Terametre per second is a unit of speed defined as terametre divided by second. Tm/s Tm s−1 Tm·s−1 petametre per second (time) Petametre per second is a unit of speed defined as petametre divided by second. Pm/s Pm s−1 Pm·s−1 exametre per second (time) Exametre per second is a unit of speed defined as exametre divided by second. Em/s Em s−1 Em·s−1 zettametre per second (time) Zettametre per second is a unit of speed defined as zettametre divided by second. Zm/s Zm s−1 Zm·s−1 yottametre per second (time) Yottametre per second is a unit of speed defined as yottametre divided by second. Ym/s Ym s−1 Ym·s−1 metre per yoctosecond (time) Metre per yoctosecond is a unit of speed defined as metre divided by yoctosecond. m/ys m ys−1 m·ys−1 metre per zeptosecond (time) Metre per zeptosecond is a unit of speed defined as metre divided by zeptosecond. m/zs m zs−1 m·zs−1 metre per attosecond (time) Metre per attosecond is a unit of speed defined as metre divided by attosecond. m/as m as−1 m·as−1 metre per femtosecond (time) Metre per femtosecond is a unit of speed defined as metre divided by femtosecond. m/fs m fs−1 m·fs−1 metre per picosecond (time) Metre per picosecond is a unit of speed defined as metre divided by picosecond. m/ps m ps−1 m·ps−1 metre per nanosecond (time) Metre per nanosecond is a unit of speed defined as metre divided by nanosecond. m/ns m ns−1 m·ns−1 metre per microsecond (time) Metre per microsecond is a unit of speed defined as metre divided by microsecond. m/μs m μs−1 m·μs−1 metre per millisecond (time) Metre per millisecond is a unit of speed defined as metre divided by millisecond. m/ms m ms−1 m·ms−1 metre per centisecond (time) Metre per centisecond is a unit of speed defined as metre divided by centisecond. m/cs m cs−1 m·cs−1 metre per decisecond (time) Metre per decisecond is a unit of speed defined as metre divided by decisecond. m/ds m ds−1 m·ds−1 metre per decasecond (time) Metre per decasecond is a unit of speed defined as metre divided by decasecond. m/das m das−1 m·das−1 metre per hectosecond (time) Metre per hectosecond is a unit of speed defined as metre divided by hectosecond. m/hs m hs−1 m·hs−1 metre per kilosecond (time) Metre per kilosecond is a unit of speed defined as metre divided by kilosecond. m/ks m ks−1 m·ks−1 metre per megasecond (time) Metre per megasecond is a unit of speed defined as metre divided by megasecond. m/Ms m Ms−1 m·Ms−1 metre per gigasecond (time) Metre per gigasecond is a unit of speed defined as metre divided by gigasecond. m/Gs m Gs−1 m·Gs−1 metre per terasecond (time) Metre per terasecond is a unit of speed defined as metre divided by terasecond. m/Ts m Ts−1 m·Ts−1 metre per petasecond (time) Metre per petasecond is a unit of speed defined as metre divided by petasecond. m/Ps m Ps−1 m·Ps−1 metre per exasecond (time) Metre per exasecond is a unit of speed defined as metre divided by exasecond. m/Es m Es−1 m·Es−1 metre per zettasecond (time) Metre per zettasecond is a unit of speed defined as metre divided by zettasecond. m/Zs m Zs−1 m·Zs−1 metre per yottasecond (time) Metre per yottasecond is a unit of speed defined as metre divided by yottasecond. m/Ys m Ys−1 m·Ys−1 metre per second (time) squared Metre per second squared is a unit of acceleration defined as metre divided by second squared. Metre per second squared is a unit of acceleration defined as metre divided by second squared. Metre per second squared is a derived unit in the International System of Units. m/s2 m s−2 m·s−2 yoctometre per second (time) squared Yoctometre per second squared is a unit of acceleration defined as yoctometre divided by second squared. ym/s2 ym s−2 ym·s−2 zeptometre per second (time) squared Zeptometre per second squared is a unit of acceleration defined as zeptometre divided by second squared. zm/s2 zm s−2 zm·s−2 attometre per second (time) squared Attometre per second squared is a unit of acceleration defined as attometre divided by second squared. am/s2 am s−2 am·s−2 femtometre per second (time) squared Femtometre per second squared is a unit of acceleration defined as femtometre divided by second squared. fm/s2 fm s−2 fm·s−2 picometre per second (time) squared Picometre per second squared is a unit of acceleration defined as picometre divided by second squared. pm/s2 pm s−2 pm·s−2 nanometre per second (time) squared Nanometre per second squared is a unit of acceleration defined as nanometre divided by second squared. nm/s2 nm s−2 nm·s−2 micrometre per second (time) squared Micrometre per second squared is a unit of acceleration defined as micrometre divided by second squared. μm/s2 μm s−2 μm·s−2 millimetre per second (time) squared Millimetre per second squared is a unit of acceleration defined as millimetre divided by second squared. mm/s2 mm s−2 mm·s−2 centimetre per second (time) squared Centimetre per second squared is a unit of acceleration defined as centimetre divided by second squared. cm/s2 cm s−2 cm·s−2 decimetre per second (time) squared Decimetre per second squared is a unit of acceleration defined as decimetre divided by second squared. dm/s2 dm s−2 dm·s−2 decametre per second (time) squared Decametre per second squared is a unit of acceleration defined as decametre divided by second squared. dam/s2 dam s−2 dam·s−2 hectometre per second (time) squared Hectometre per second squared is a unit of acceleration defined as hectometre divided by second squared. hm/s2 hm s−2 hm·s−2 kilometre per second (time) squared Kilometre per second squared is a unit of acceleration defined as kilometre divided by second squared. km/s2 km s−2 km·s−2 megametre per second (time) squared Megametre per second squared is a unit of acceleration defined as megametre divided by second squared. Mm/s2 Mm s−2 Mm·s−2 gigametre per second (time) squared Gigametre per second squared is a unit of acceleration defined as gigametre divided by second squared. Gm/s2 Gm s−2 Gm·s−2 terametre per second (time) squared Terametre per second squared is a unit of acceleration defined as terametre divided by second squared. Tm/s2 Tm s−2 Tm·s−2 petametre per second (time) squared Petametre per second squared is a unit of acceleration defined as petametre divided by second squared. Pm/s2 Pm s−2 Pm·s−2 exametre per second (time) squared Exametre per second squared is a unit of acceleration defined as exametre divided by second squared. Em/s2 Em s−2 Em·s−2 zettametre per second (time) squared Zettametre per second squared is a unit of acceleration defined as zettametre divided by second squared. Zm/s2 Zm s−2 Zm·s−2 yottametre per second (time) squared Yottametre per second squared is a unit of acceleration defined as yottametre divided by second squared. Ym/s2 Ym s−2 Ym·s−2 metre per yoctosecond (time) squared Metre per yoctosecond squared is a unit of acceleration defined as metre divided by yoctosecond squared. m/ys2 m ys−2 m·ys−2 metre per zeptosecond (time) squared Metre per zeptosecond squared is a unit of acceleration defined as metre divided by zeptosecond squared. m/zs2 m zs−2 m·zs−2 metre per attosecond (time) squared Metre per attosecond squared is a unit of acceleration defined as metre divided by attosecond squared. m/as2 m as−2 m·as−2 metre per femtosecond (time) squared Metre per femtosecond squared is a unit of acceleration defined as metre divided by femtosecond squared. m/fs2 m fs−2 m·fs−2 metre per picosecond (time) squared Metre per picosecond squared is a unit of acceleration defined as metre divided by picosecond squared. m/ps2 m ps−2 m·ps−2 metre per nanosecond (time) squared Metre per nanosecond squared is a unit of acceleration defined as metre divided by nanosecond squared. m/ns2 m ns−2 m·ns−2 metre per microsecond (time) squared Metre per microsecond squared is a unit of acceleration defined as metre divided by microsecond squared. m/μs2 m μs−2 m·μs−2 metre per millisecond (time) squared Metre per millisecond squared is a unit of acceleration defined as metre divided by millisecond squared. m/ms2 m ms−2 m·ms−2 metre per centisecond (time) squared Metre per centisecond squared is a unit of acceleration defined as metre divided by centisecond squared. m/cs2 m cs−2 m·cs−2 metre per decisecond (time) squared Metre per decisecond squared is a unit of acceleration defined as metre divided by decisecond squared. m/ds2 m ds−2 m·ds−2 metre per decasecond (time) squared Metre per decasecond squared is a unit of acceleration defined as metre divided by decasecond squared. m/das2 m das−2 m·das−2 metre per hectosecond (time) squared Metre per hectosecond squared is a unit of acceleration defined as metre divided by hectosecond squared. m/hs2 m hs−2 m·hs−2 metre per kilosecond (time) squared Metre per kilosecond squared is a unit of acceleration defined as metre divided by kilosecond squared. m/ks2 m ks−2 m·ks−2 metre per megasecond (time) squared Metre per megasecond squared is a unit of acceleration defined as metre divided by megasecond squared. m/Ms2 m Ms−2 m·Ms−2 metre per gigasecond (time) squared Metre per gigasecond squared is a unit of acceleration defined as metre divided by gigasecond squared. m/Gs2 m Gs−2 m·Gs−2 metre per terasecond (time) squared Metre per terasecond squared is a unit of acceleration defined as metre divided by terasecond squared. m/Ts2 m Ts−2 m·Ts−2 metre per petasecond (time) squared Metre per petasecond squared is a unit of acceleration defined as metre divided by petasecond squared. m/Ps2 m Ps−2 m·Ps−2 metre per exasecond (time) squared Metre per exasecond squared is a unit of acceleration defined as metre divided by exasecond squared. m/Es2 m Es−2 m·Es−2 metre per zettasecond (time) squared Metre per zettasecond squared is a unit of acceleration defined as metre divided by zettasecond squared. m/Zs2 m Zs−2 m·Zs−2 metre per yottasecond (time) squared Metre per yottasecond squared is a unit of acceleration defined as metre divided by yottasecond squared. m/Ys2 m Ys−2 m·Ys−2 mole per cubic metre Mole per cubic metre is a unit of amount of mass concentration defined as mole divided by cubic metre. Mole per cubic metre is a unit of amount of mass concentration defined as mole divided by cubic metre. Mole per cubic metre is a derived unit in the International System of Units. mol/m3 mol m−3 mol·m−3 mole per second (time) mol/s mol s−1 mol·s−1 nautical mile per hour Nautical mile per hour is a unit of speed defined as nautical mile divided by hour. nmi/h nmi h-1 nmi·h-1 M/h M h-1 M·h-1 NM/h NM h-1 NM·h-1 nm/h nm h-1 nm·h-1 newton per square metre N/m2 N m−2 N·m−2 radian per second (time) rad/s rad s−1 rad·s−1 radian per second (time) squared rad/s2 rad s−2 rad·s−2 volt per ampere V/A V A−1 V·A−1 volt per metre V/m V m−1 V·m−1 watt per ampere W/A W A−1 W·A−1 watt per metre kelvin W/m K W/m·K W m-1 K−1 W·m-1·K-1 watt per square metre W/m2 W m−2 W·m−2 watt per square metre steradian W/m2 sr W/m2·sr W m-2 sr−1 W·m-2·sr-1 watt per steradian W/sr W sr−1 W·sr−1 weber per ampere Wb/A Wb A−1 Wb·A−1 weber per square metre Wb/m2 Wb m−2 Wb·m−2 prefix SI prefix yocto y 1e-24 zepto z 1e-21 atto a 1e-18 pico p 1e-12 femto f 1e-15 nano n 1e-9 micro μ u 1e-6 milli m 1e-3 centi c 1e-2 deci d 1e-1 deca deka da 1e1 hecto h 1e2 kilo k 1e3 mega M 1e6 giga G 1e9 tera T 1e12 peta P 1e15 exa E 1e18 zetta Z 1e21 yotta Y 1e24 binary prefix kibi kilobinary Ki 1024 mebi megabinary Mi 1048576 gibi gigabinary Gi 1073741824 tebi terabinary Ti 1099511627776 pebi petabinary Pi 1125899906842624 exbi exabinary Ei 1152921504606846976 zebi Zi 1180591620717411303424 yobi Yi 1208925819614629174706176 quantity A quantity is a representation of a quantifiable (standardized) aspect of a phenomenon. Quantities are classified on the basis of similarity in (implicit) metrological aspect. length Length is the amount of space between two geographical points along a curve. It is a base quantity in the International System of Units and other systems of units. Length is speed times time. The metre, a base unit of length in the International System of Units, is defined in terms of speed of light during a certain time interval. l L breadth b depth d diameter d displacement d distance d font size height h radius r thickness d δ wavelength λ width w length of the path travelled by light in vacuum during a time interval of 1/299 792 458 of a second mass Mass is the amount of matter of a phenomenon. It is a base quantity in the International System of Units. Mass is force divided by acceleration. m mass of the international prototype of the kilogram atomic mass ma time Time is a base quantity in the International System of Units and other systems of units. It is measured by numbers of repetitions of cyclical events. t duration duration of 9 192 631 770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the cesium 133 atom period T electric current current Electric current is the flow of electric charge. It is a base quantity in the International System of Units. Electric current is electric charge divided by time. I i constant current that produces an attractive force of 2e–7 newton per metre of length between two straight, parallel conductors of infinite length and negligible circular cross section placed one metre apart in a vacuum temperature Temperature is the extent to which an object is hot. T t θ Celsius temperature temperature t θ Fahrenheit temperature temperature T Rankine temperature temperature T Réaumur temperature temperature T thermodynamic temperature temperature Thermodynamic temperature is the absolute measure of temperature. Its zero point is the temperature at which the particle constituents of matter have minimal motion and can be no colder. Thermodynamic temperature is a base quantity in the International System of Units. T 1/273.16 of the thermodynamic temperature of the triple point of water amount of substance Amount of substance is the number of elementary entities such as atoms, molecules, electrons, particles, etc. present in a phenomenon. It is a base quantity in the International System of Units. n amount of substance of a system that contains as many elementary entities as there are atoms in 0.012 kilogram of carbon 12 luminous intensity Luminous intensity is the wavelength-weighted power emitted by a light source in a particular direction per unit solid angle. It is a base quantity in the International System of Units. Luminous intensity is luminous flux divided by solid angle. I Iv luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540e12 hertz and that has a radiant intensity in that direction of 1/683 watt per steradian area Area expresses the two-dimensional size of a defined part of a surface, typically a region bounded by a closed curve. It is a derived quantity in the International System of Units. Area is length squared. A S volume Volume is a measure of how much three-dimensional space any phenomenon occupies. It is a derived quantity in the International System of Units. Volume is length to the power 3. V v speed Speed is the time rate of motion measured by the distance moved over in unit time. v u velocity Velocity is the rate of change of position. u v w acceleration a gravitational acceleration acceleration of free fall g wave number Wave number is the number of repeating units of a propagating wave (the number of times a wave has the same phase) per unit of space. σ density mass density Density is the concentration of matter. It is a derived quantity in the International System of Units. Density is mass divided by volume. ρ specific volume Specific volume is volume per unit mass. v current density Current density is the density of flow of a conserved charge. It is a derived quantity in the International System of Units. Current density is electric current divided by area. J j magnetic field strength magnetic field intensity magnetizing field H current density amount of substance concentration molar concentration C luminance Luminous flux is the total visible energy emitted by a source per unit time. L Lv plane angle angle Plane angle is the ratio between an arc and its radius. α β γ θ φ angular displacement solid angle Solid angle is the ratio of the surface of a portion of a sphere enclosed by the conical surface that forms an angle to the square of the radius of the sphere. Ω ω frequency Frequency is a measure of the number of occurrences of a repeating event per unit time. f ν collision frequency Collision frequency is the average number of collisions between reacting molecules per unit time. νcoll νc force Force is the extent to which an object with mass can be caused to accelerate. It is a derived quantity in the International System of Units. Force is mass times acceleration. F weight Weight is a force that attracts a body towards another (reference) body. G W P pressure Pressure is the force applied to or distributed over a surface. It is a derived quantity in the International System of Units. Pressure is force divided by area. p P stress Stress is a force that produces or tends to produce deformation in a body measured by the force applied per unit area. σ normal stress shear stress Shear stress is a stress that is applied parallel or tangential to a face of a material. τ energy Energy can be defined as the ability to do work. It is a derived quantity in the International System of Units. E W acceptor ionization energy Ea dissociation energy donor ionization energy Ed energy gap Eg energy of particle ε Fermi energy EF εF heat quantity of heat Heat is any flow of energy from one body or system to another due to a difference in temperature. Q interaction energy between particles i and j φij Vij internal energy The internal energy of a thermodynamic system, or a body with well-defined boundaries is the total of the kinetic energy due to the motion of molecules (translational, rotational, vibrational) and the potential energy associated with the vibrational and electric energy of atoms within molecules or crystals. U ionization energy electron ionization energy Ei kinetic energy Kinetic energy is energy due to motion. Ek T K potential energy Potential energy is energy due to position of one body with respect to another or to the relative parts of the same body. Ep V Φ U radiant energy Q Qe W reaction energy disintegration energy Q superconductor energy gap Δ work Work is the energy when a force acts against resistance to produce motion in a body. W A torque moment of a couple Torque is the effectiveness of a force to produce rotation about an axis, measured by the product of the force and the perpendicular distance from the line of action of the force to the axis. T moment of force moment Moment of force is the effectiveness of a force to produce rotation about an axis measured by the product of the force and the perpendicular distance from the line of action of the force to the axis. M power Power is the time rate at which work is done. It is a derived quantity in the International System of Units. Power is energy divided by time. P heat flow rate Φ q radiant flux radiant energy flux radiant power Radiant flux is the measure of the total power of electromagnetic radiation. Φ Φe P electric charge quantity of electricity Electric charge is a conserved property of some subatomic particles, which determines their electromagnetic interaction. It is a derived quantity in the International System of Units. Electric charge is electric current times time. Q q electric potential voltage Electric potential is the potential energy per unit charge associated with static (time-invariant) electric field. V φ electromotive force Electromotive force is that which causes a flow of current. E emf potential difference U V capacitance electric capacitance Capacitance is the ability to hold electrical charge. It is a derived quantity in the International System of Units. Capacitance is electric charge divided by electric potential. C electrical resistance electric resistance resistance Electrical resistance is the degree to which an object opposes an electric current through it. It is a derived quantity in the International System of Units. Electrical resistance is electric potential divided by electric current. R electrical conductance electric conductance conductance Electrical conductance is a measure of how easily electricity flows along a certain path through an electrical element. G magnetic flux Magnetic flux through any area perpendicular to a magnetic field is the product of the area by the field strength. Φ magnetic flux density magnetic field magnetic induction B inductance Inductance is that property in an electrical circuit where a change in the current flowing through that circuit induces an electromotive force that opposes the change in current. permeance (electromagnetic) electromagnetic permeance permeance Electromagnetic permeance is a measure of flux for a number of current-turns in magnetic circuit. Λ luminous flux Luminous flux is the total visible energy emitted by a source per unit time. F illuminance illumination Illuminance is the total luminous flux incident on a surface per unit area. Φ Φv absorbed dose total ionizing dose Absorbed dose is the energy deposited in a medium by ionizing radiation. It is a derived quantity in the International System of Units. Absorbed dose is energy divided by mass. kerma specific energy imparted specific energy (imparted) dose equivalent Dose equivalent is a measure of the radiation dose to tissue where an attempt has been made to allow for the different relative biological effects of different types of ionizing radiation. ambient dose equivalent directional dose equivalent organ dose equivalent personal dose equivalent specific energy Specific energy is energy per unit mass. activity activity (of a radionuclide) activity of a radionuclide Activity is the decay rate of a radioactive substance. It is a derived quantity in the International System of Units. Activity is 1 divided by time. A catalytic activity activity angular speed angular velocity ω angular acceleration α dynamic viscosity heat flux density irradiance Irradiance is the power of electromagnetic radiation at a surface per unit area. E Ee radiant intensity I Ie radiance Radiance is a radiometric measure that describes the amount of light that passes through or is emitted from a particular area and falls within a given solid angle in a specified direction. L Le entropy Entropy is a measure of the unavailability of a system’s energy to do work. S heat capacity Heat capacity is the heat required to increase the temperature of a system or substance one unit temperature. Cp Cv specific entropy specific heat capacity cp cv thermal conductivity Termal conductivity indicates the ability of a material to conduct heat. κ k K λ energy density Energy density is the amount of energy stored in a given system or region of space per unit volume. electric field electric field strength Electric field is a property of the space surrounding an electric charge or in the presence of a time-varying magnetic field which exerts a forceon other electrically charged objects. E electric charge density charge density Electric charge density is the amount of electric charge in a volume. It is a derived quantity in the International System of Units. Electric charge density is electric charge divided by volume. electric flux density permittivity ε permeability of free space vacuum permeability permeability μ molar energy molar entropy molar heat capacity gas constant universal gas constant R exposure to x and γ rays exposure to x and gamma rays exposure (to x and γ rays) exposure (to x and gamma rays) exposure absorbed dose rate phenomenon 9 192 631 770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the cesium 133 atom international prototype of the kilogram path travelled by light in vacuum during a time interval of 1/299 792 458 of a second system that contains as many elementary entities as there are atoms in 0.012 kilogram of carbon 122 0.013837000138370001383700013837 0.013888888888888888888888888888889 0.3514598e-3 0.3759e-3 1.0e-1 1.0e-1 1.0e-10 1.0e-15 1.0e-2 1.0e-2 1.0e-3 1.0e-3 1.0e-4 1.0e-5 1.0e-6 1.0e-7 1.0e-8 1.0e-8 1.0e-8 1.0e-9 1.0e-9 1.0e-9 1.0e-28 1.0e1 1.0e1 1.0e2 1.0e2 1.0e3 1.0e4 1.0e4 1.0e5 1.0e9 1.0e9 1.0e15 1.01325e5 1.016047e3 1.054350e3 1.05468e3 1.05480e3 1.054804e8 1.055056e3 1.05506e8 1.05587e3 1.05967e3 1.076391e1 1.101221e-3 1.112650e-12 1.112650e-12 1.1365 1.182941e-4 1.233489e3 1.25 1.256637e-7 1.333224e2 1.382550e-1 1.420653e-4 1.459390e1 1.478676e-5 1.495979e11 1.555174e-3 1.570796e-2 1.589873e-1 1.602177e-19 1.609344e3 1.609347e3 1.745329e-2 1.828804 12 12 12 12 1852 2.0e-4 2.011684e1 2.365882e-4 2.54e-2 2.54e-5 2.58e-4 2.831658 2.834952e-2 2.841306e-5 2.908882e-4 2.916667e-2 2.957353e-5 2.9979e6 2.9979e2 2.997925e2 201.168 3.048e-1 3.048006e-1 3.08567802e16 3.110348e-2 3.1536e7 3.155693e7 3.155815e7 3.183099e3 3.335641e-10 3.335641e-10 3.426259 3.516853e3 3.523907e-2 3.590170e3 3.6e3 3.624556 3.7e10 3.732417e-1 3.785412e-3 4.046873e3 4.18190 4.184 4.184e9 4.18580 4.1868 4.19002 4.214011e-2 4.40488377086e-3 4.448222 4.448222e3 4.535924e-1 4.535924e1 4.54609e-3 4.731765e-4 4.848137e-6 4.928922e-6 5.029210 5.067075e-10 5.067075e-10 5.080235e1 5.555556e-1 5.983617e1 568.26125 6.0e1 6.283185 6.479891e-5 7.354988e2 7.4570e2 7.46e2 7.46043e2 7.957747e-1 7.957747e1 8.616409e4 8.809768e-3 8.896443e3 8.987552e11 8.987552e11 86400 9.071847e2 9.144e-1 9.46073e15 9.463529e-4 9.648531e4 9.80665e4 9.80950e3 9.817477e-4 9.972696e-1 measurement scale scale nominal scale measurement scale category ordinal scale ordered measurement scale category cardinal scale interval scale Celsius scale International Celsius Temperature scale of 1990 t90/°C = T90/K - 273.15 1 -273.15 Fahrenheit scale 1.8 -459.67 Réaumur scale 1 -218.52 ratio scale Kelvin scale International Kelvin Temperature scale of 1990 Rankine scale 1.8 0 point fixed point -270.15 to -268.15 on the Celsius scale One of the fixed points defining the Celsius scale -270.15 to -268.15 -259.3467 on the Celsius scale -259.3467 ~-256.15 on the Celsius scale ~-256.15 ~-252.85 on the Celsius scale ~-252.85 -248.5939 on the Celsius scale -248.5939 -218.7916 on the Celsius scale -218.7916 -189.3442 on the Celsius scale -189.3442 -38.8344 on the Celsius scale -38.8344 0.01 on the Celsius scale 0.01 29.7646 on the Celsius scale 29.7646 156.5985 on the Celsius scale 156.5985 231.928 on the Celsius scale 231.928 419.527 on the Celsius scale 419.527 660.323 on the Celsius scale 660.323 961.78 on the Celsius scale 961.78 1064.18 on the Celsius scale 1064.18 1084.62 on the Celsius scale 1084.62 3 to 5 on the Kelvin scale 3 to 5 13.8033 on the Kelvin scale 13.8033 ~17 on the Kelvin scale ~17 ~20.3 on the Kelvin scale ~20.3 24.5561 on the Kelvin scale 24.5561 54.3584 on the Kelvin scale 54.3584 83.8058 on the Kelvin scale 83.8058 234.3156 on the Kelvin scale 234.3156 273.16 on the Kelvin scale 273.16 302.9146 on the Kelvin scale 302.9146 429.7485 on the Kelvin scale 429.7485 505.078 on the Kelvin scale 505.078 692.677 on the Kelvin scale 692.677 933.473 on the Kelvin scale 933.473 1234.93 on the Kelvin scale 1234.93 1337.33 on the Kelvin scale 1337.33 1357.77 on the Kelvin scale 1357.77 fixed zero point 0 dimension absorbed dose rate dimension absorbed dose rate 2 0 -3 0 0 0 0 acceleration dimension acceleration 1 0 -2 0 0 0 0 amount of substance concentration dimension amount of substance concentration -3 0 0 0 0 1 0 amount of substance dimension amount of substance N 0 0 0 0 0 1 0 angular acceleration dimension angular acceleration 0 0 -2 0 0 0 0 angular speed dimension angular speed 0 0 -1 0 0 0 0 area dimension area 2 0 0 0 0 0 0 capacitance dimension capacitance -2 -1 4 1 0 0 0 catalytic activity dimension catalytic activity 0 0 -1 0 0 1 0 current density dimension current density -1 0 0 1 0 0 0 density dimension density -3 1 0 0 0 0 0 dimension_one one 1 0 0 0 0 0 0 0 dynamic viscosity dimension dynamic viscosity -1 1 -1 0 0 0 0 electric charge dimension electric charge 0 0 1 1 0 0 0 electric charge density dimension electric charge density -3 0 1 1 0 0 0 electric current dimension electric current I 0 0 0 1 0 0 0 electric field dimension electric field 1 1 -3 -1 0 0 0 electric flux density dimension electric flux density -2 0 1 1 0 0 0 electric potential dimension electric potential 2 1 -3 -1 0 0 0 electrical conductance dimension electrical conductance L -2 -1 3 1 0 0 0 electrical resistance dimension electrical resistance 2 1 -3 -2 0 0 0 energy density dimension energy density -1 1 -2 0 0 0 0 energy, torque, or moment of force dimension energy, torque, or moment of force 2 1 -2 0 0 0 0 entropy or heat capacity dimension entropy or heat capacity 2 1 -2 0 -1 0 0 exposure_to_x_and_γ_rays dimension exposure_to_x_and_γ_rays 0 -1 1 1 0 0 0 force dimension force 1 1 -2 0 0 0 0 frequency or activity dimension frequency or activity 0 0 -1 0 0 0 0 heat flux density dimension heat flux density 0 1 -3 0 0 0 0 illuminance dimension illuminance -2 0 0 0 0 0 1 inductance or permeance (electromagnetic) dimension inductance or permeance (electromagnetic) 2 1 -2 -2 0 0 0 length dimension length L 1 0 0 0 0 0 0 luminance dimension luminance -2 0 0 0 0 0 1 luminous intensity dimension luminous intensity J 0 0 0 0 0 0 1 luminous flux dimension luminous flux J 0 0 0 0 0 0 1 mass dimension mass M 0 1 0 0 0 0 0 magnetic field strength dimension magnetic field strength -1 0 0 1 0 0 0 magnetic flux dimension magnetic flux 2 1 -2 -1 0 0 0 magnetic flux density dimension magnetic flux density 0 1 -2 -1 0 0 0 molar energy dimension molar energy 2 1 -2 0 0 -1 0 molar entropy, molar heat capacity, or gas constant dimension molar entropy, molar heat capacity, or gas constant 2 1 -2 0 -1 -1 0 permeability of free space dimension permeability of free space 1 1 -2 -2 0 0 0 permittivity dimension permittivity -3 -1 4 1 0 0 0 plane angle dimension plane angle 0 0 0 0 0 0 0 power dimension power 2 1 -3 0 0 0 0 pressure or stress dimension pressure or stress -1 1 -2 0 0 0 0 radiance dimension radiance 0 1 -3 0 0 0 0 solid angle dimension solid angle 0 0 0 0 0 0 0 specific energy, absorbed dose, or dose equivalent dimension specific energy, absorbed dose, or dose equivalent 2 0 -2 0 0 0 0 specific entropy or specific heat capacity dimension specific entropy or specific heat capacity 2 0 -2 0 -1 0 0 specific volume dimension specific volume 3 -1 0 0 0 0 0 speed dimension speed 1 0 -1 0 0 0 0 thermal conductivity dimension thermal conductivity 1 1 -3 0 -1 0 0 thermodynamic temperature dimension thermodynamic temperature Θ 0 0 0 0 1 0 0 time dimension time T 0 0 1 0 0 0 0 volume dimension volume 3 0 0 0 0 0 0 wave number dimension wave number -1 0 0 0 0 0 0 action or angular momentum dimension action or angular momentum 2 1 -1 0 0 1 0 catalytic activity concentration dimension catalytic activity concentration -3 0 -1 0 0 1 0 electric dipole moment dimension electric dipole moment 1 0 1 1 0 0 0 fluidity dimension fluidity 1 -1 1 0 0 0 0 kinematic viscosity dimension kinematic viscosity 2 0 -1 0 0 0 0 permeance dimension permeance -1 0 1 0 0 0 0 reluctance dimension reluctance -2 -1 2 2 0 0 0 surface tension dimension surface tension 0 1 -2 0 0 0 0 thermal resistance dimension thermal resistance 0 -1 3 0 1 0 0 system of units International System of Units SI application area abbreviation has abbreviation alternative label has alternative label alternative symbol has alternative symbol base has base base quantity has base quantity base unit has base unit definition has definition definition factor has definition factor definition off-set has definition off-set definition relative to has definition relative to definition description has definition description denominatot has denominatot derived quantity has derived quantity derived unit has derived unit dimension has dimension element has element exponent has exponent external link has external link factor has factor longcomment long comment has longcomment measurement scale has measurement scale numerator has numerator numerical value has numerical value phenomenon has phenomenon prefix has prefix quantity has quantity rank has rank SI length dimension exponent has SI length dimension exponent SI mass dimension exponent has SI mass dimension exponent SI time dimension exponent has SI time dimension exponent SI electric current dimension exponent has SI electric current dimension exponent SI thermodynamic temperature dimension exponent has SI thermodynamic temperature dimension exponent SI amount of substance dimension exponent has SI amount of substance dimension exponent SI luminous intensity dimension exponent has SI luminous intensity dimension exponent singular unit has singular unit symbol has symbol term 1 has term 1 term 2 has term 2 unit of measure has unit of measure unit of measure or measurement scale has unit of measure or measurement scale zero element has zero element