Re: [uom-ontology-std] What is mass?

[ravi sharma <drravisharma@xxxxxxxxx>]

Gunther

Share your statement on need to harmonize. Harmonization is easier if we adapt for practical aspects of units ontology in a concerted effort on defining Terms and their english meaning, and also a Vocabulary where these are tied. Then ontology (OWL or RDF based for example) will connect these semantically and we would achieve haronization through this proces. I hope, I am able to state it reasonably?

Thanks.
Ravi

On Sun, Sep 27, 2009 at 10:10 PM, Gunther Schadow <gschadow@xxxxxxxxxxxxxxx> wrote:

The Newton-meter issue and the dimension 1 issue come up repeatedly.
Someone was claiming that UCUM contradicts the VIM when UCUM says that
100% = 100%. I do not see the contradiction. I don't recall VIM
making any arguments about dimensionless quantities and their units
somehow preserving a difference.

May be we should proceed by putting certain simple questions up for
discussion. Such as whether 1 = 1 :)

Clearly it is known that the unit does not preserve the full detail of
the quantity. And attempts to make unit concepts that preserve such
a difference are futile. A Newton-meter is a Newton-meter and 1 is 1.
Equality in quantity value expressions do not imply equality in
quantities.

BTW, there may be some inconsistencies between UCUM and VIM/SI, and
those are not significantly changing the practical behavior of the
system and are there for various convictions. But they are all up
for negotiation once the time comes to negotiate harmonization.

regards,
-Gunther

ravi sharma wrote:
> Well put, let us focus on the objective.
>
> On Sat, Sep 26, 2009 at 7:51 PM, Weber, Martin S. <martin.weber@xxxxxxxx

> <mailto:martin.weber@xxxxxxxx>> wrote:
>
>     > Pat Hayes:
>     > Um... as I recall from the telecon presentation, UCUM treats angle as
>     > a physical dimension, so this entire debate is beside the point. There
>     > is a *unit* distinction between angle and count; angle is not
>     > dimensionless in UCUM. Very sensible move.
>
>     Uh well, reading the semantics of UCUM IIUC angle and count are
>     different units but they are not different dimensions. About them
>     being different units and thus the debate being beside the point:
>     Don't be so difficult :D If you prefer it, then let's talk about
>     newton-meter
>     vs. newton-meter. Oh. Am I talking about two different things here?
>     Do I need a (kind of, +) quantity here? When you're done redefining
>     physics, metrology, and the VIM, reknitted the SI, abolished some
>     units of measure in use, and introduced others, ... someone
>     will tell me whether I'm talking about torque or something different.
>
>     I'm sorry guys, but sometimes I get the impression you wanna tackle
>     the world and not creating a standard ontology for units of measure
>     and their necessary related concepts. Do you expect all the users of
>     the ontology understand all of the underlying concepts?
>
>     Regards,
>
>     -Martin
>
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> --
> Thanks.
> Ravi
> (Dr. Ravi Sharma)
> 313 204 1740 Mobile
>
>

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--

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

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Thanks.
Ravi
(Dr. Ravi Sharma)
313 204 1740 Mobile
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