STP (was atmosphere and compressor maps -read'n 'riting & 'ritmatic)

[Dan Masi]

> -----Original Message-----
> From: Stephen Bigelow [mailto:sbigelow at sprint.ca]
> Sent: Monday, March 19, 2001 12:56 PM
> To: quattro at audifans.com
> Subject: STP (was atmosphere and compressor maps -read'n 'riting &
> 'ritmatic)
>
>
>
> > >Standard air temperature is considered 59 Degrees @
> > >29.235 inches Hg. If my memory serves me correctly.
> >
> > That sounds like a strange "standard temperature" to a
> chemist's ear.
> > Although standard conditions in use for turbo compressor
> calculations
> > might be different, the standard temp that's defined by
> international
> > convention for gas-property calculations is 0 degrees C (32 F).
>
> STP is 0C and 1 atm. Sources below.

Apparently, there's confusion about the term "standard".  Different
industries seem to use different standards when discussing gas properties
(e.g. the natural gas industry using 1atm/60F as their standard).
A quick web search shows plenty of counterexamples to the 0C / 1atm usage.
For just a couple of examples, try this first-year chem text, which uses
25C / 1 bar:
http://www.chem.ualberta.ca/courses/plambeck/p101/p01066.htm

or look at STP conditions for nitrogen from this online periodic table
reference,
which uses 20C / 1 atm:

http://klbproductions.com/yogi/periodic/N.html


-dan