On Monday, May 8, 2017 at 7:57:30 PM UTC-4, Neon John wrote:
On Sat, 6 May 2017 14:21:09 -0700 (PDT), wrote:


That was my suggestion. Ideal gas law.
P*V=N*k*T. I think you could just use compressed
air. As long as you know the tank volume on your
compressor and have a good pressure gauge.
(T is in Kelvin)

You absolutely can NOT use the ideal gas law because none of the
gasses are ideal. The Van der Walls equation must be used. Learn all
about it he

https://opentextbc.ca/chemistry/chap...-gas-behavior/

John
John DeArmond
http://www.neon-john.com
http://www.tnduction.com
Tellico Plains, Occupied TN
See website for email address

Well, yes but...we're talking about approximately 2.25 cubic meters pressurized to about 2 atmospheres. Either way, though, I'll have P, n & t recorded to the best my instrumentation can give. Besides, I'm not buying refrigerant by the teaspoonful. If I get within a couple of hundred pounds, that's good enough.