On 4/13/2011 2:52 PM, Steve Emmerson wrote:
> On 04/13/2011 02:25 PM, John Caron wrote:
>> the point im trying to make is that it would be better to understand
>> that "mol mol-1" (canonical udunit = 1) is not the same as "m3 m-3"
>> (canonical udunit = 1).
> In my opinion, the distinction between "mol/mol" and "m3/m3" is better
> indicated by the name of the physical quantity being displayed rather
> than by its unit attribute. In the cases under consideration, the
> respective physical quantities would be "amount of substance fraction"
> and "volume fraction".
>
> See Table 12 of<http://physics.nist.gov/Pubs/SP811/sec08.html> for more
> information.
>
> For example, the Y-axis of a plot could be labeled "Amount of Substance
> Fraction of Carbon / 1e-9" to plot nanomoles of carbon per mole of whatever.
>
> Regards,
> Steve Emmerson
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Hi Steve:
Thanks, that a useful reference. It may be that some extension to
udunits following Table 12 could solve most of the issues.
Im thinking that ne wants a grammer that allows
"mole <X> / mole" * "mole/ mole <X>" = 1
"mole <X> / mole" * "mole/ mole <Y>"= "mole <X>/ mole <Y>"
and so on.
I wonder if this list could accumulate a list of such examples.
John
Received on Thu Apr 14 2011 - 20:10:00 BST
