James Davenport wrote: (01)
> Personally, I'm not sure that I would give 'length' and 'width'
> different kinds, but that's why we will (when we actually get down to
> talking about populating the ontology) be having these debates. Two
> better examples are torque and energy, (02)
Torque and energy are different kinds of quantity, and their instances
are not comparable. The confusion here arises from the fact that they
differ in their dimensional formulations by multiplication by a kind of
quantity (angle) that has no "unit". (Its model is arc length/radius,
i.e. length/length.) (03)
> or the distinction between relative and non-relative temperatures (04)
Pandora's box number 2. Absolute temperatures (which is the usual kind)
and date-time are very special problems. They don't work like other
measurements. (05)
-Ed (06)
--
Edward J. Barkmeyer Email: edbark@xxxxxxxx
National Institute of Standards & Technology
Manufacturing Systems Integration Division
100 Bureau Drive, Stop 8263 Tel: +1 301-975-3528
Gaithersburg, MD 20899-8263 FAX: +1 301-975-4694 (07)
"The opinions expressed above do not reflect consensus of NIST,
and have not been reviewed by any Government authority." (08)
_________________________________________________________________
Message Archives: http://ontolog.cim3.net/forum/uom-ontology-std/
Subscribe: mailto:uom-ontology-std-join@xxxxxxxxxxxxxxxx
Config/Unsubscribe: http://ontolog.cim3.net/mailman/listinfo/uom-ontology-std/
Shared Files: http://ontolog.cim3.net/file/work/UoM/
Wiki: http://ontolog.cim3.net/cgi-bin/wiki.pl?UoM_Ontology_Standard (09)
|