"dpb" wrote in message
news
On 05/09/2017 10:36 AM, Neon John wrote:
...

Mine IS the voice of experience speaking.
....

Well, my ChE skoolin' tells me for these values it will be small.

But, with http://www.webqc.org/van_der_waals_gas_law.html @70F, 1
cf enough N for about 2 atm yields P ~ 172580 Pa (~1.7 atm) while
ideal gas law for same is 173436 or about 0.5% difference.

Will have to get _very_ high pressures to make difference of any
significance and the point here isn't @ operating pressure but just
a measure of physical volume. In fact to get around 5%, took
overall P~80 atm.


This shows that the deviation of N2 isn't too bad at cylinder
pressure, perhaps less than the tolerance of uncalibrated gauges and
other experimental errors.
http://wps.prenhall.com/wps/media/ob...1/blb1009.html
-jsw