[LON-CAPA-users] parts per million as a unit

lon-capa-users@mail.lon-capa.org lon-capa-users@mail.lon-capa.org
Tue, 10 Jul 2007 14:22:46 -0400 (EDT)

I do use ppm in some of my air pollution problems (see directory civil eng
at MSU)  but I specify the units and do not have the students input ppm,
ppb, ppt, etc.  I do this because the conversions are dependent on the
media.  It would probably be too difficult to have unit conversions where
one must specify the media, density, temperature, etc.


> I gather that ppm is not an acceptable unit in LON-CAPA.  Is that correct?
> (When I try to enter it as a unit, I get an error message that the
> computer
> answer is wrong, and either the tolerance or the sig fig should be
> changed--even though the answer is within both).
> Does anyone else think this is a feature we should have (with, perhaps
> conversions to ppb,ppt and pph --parts per billion, parts per thousand and
> parts per hundred, or %), and conversions to, for example, mg/kg?  It is
> easy enough to not include the unit in the answer and just enter it
> outside
> the textbox.
> Robley
> *************************************************************
> Robley J. Light                  Professor Emeritus of Chemistry and
> Biochemistry
> Department of Chemistry          Phone:   (850) 644-3844
>    and Biochemistry              Email:  rlight@chem.fsu.edu
> Florida State University         Fax:      (850) 644-8281
> Tallahassee, FL 32306-4390    Home Page:
> http://www.chem.fsu.edu/editors/rlight
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