Martin S. Weber wrote:
>> But multiplying 1 N.m with 1 m / m gets you 1 N.m and how do you carry
>> whatever distinction you like to preserve in the unit through the
>> computation?
>
> Obviously, by looking at the quantities involved. (01)
Yes, the Quantities, not the Units. (02)
> Imagine you take a Nm and make a torque out of it by multiplying with m/m.
> That gives a different quantity. (03)
Yes, the Quantities. But 1 Nm * m/m is still 1 Nm. (04)
> This information has to be preserved /
> presented. (05)
Yes, but in the Quantities, not the Units. (06)
> Honestly, I lost overview of whether the majority of UoM-involved people now
> think that quantities should not be accounted for (which, imo, is bad) or
> should. (07)
This shows that the list of test cases on the Wiki will be
tremendously useful so we can at least know where everyone
stands. (08)
> And of course the examples easily fall back to involving dimensionless
> units. Of course because that's where the quantity makes the difference. (09)
You can add other test cases. (010)
> Which, due to SI/VIM has the final say on whether two things are comparable
> [without further thought] or not. Which is something that UoM instance data
> should be able to provide. Which is ... turning in circles. (011)
The VIM speaks about Quantities and measurement and a little
bit about Units. The SI speaks a lot about Units. I don't think
that either one argues that Units contain the detail of the
Quantities. And if this group here is to make a Units of Measure
ontology, then it would be limited to Units, not the detail
of all Quantities. (012)
regards,
-Gunther (013)
--
Gunther Schadow, M.D., Ph.D. gschadow@xxxxxxxxxxxxxxx
Associate Professor Indiana University School of Informatics
Regenstrief Institute, Inc. Indiana University School of Medicine
tel:1(317)423-5521 http://aurora.regenstrief.org (014)
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