Re: [CAD_CAM_EDM_DRO] OT: Cubic Feet in a Compressed Gas Cylinder?

In a message dated 08/13/2000 7:21:30 AM Hawaiian Standard Time,
prototype@... writes:

<< > I am looking to be able to calculate the number of cubic feet of gas at

> standard atmospheric pressure that are in a cylinder at any given time.
>

Depends on the gas. Helium, argon and other "ideal" gasses compress in
linear relation to the pressure. Thus, volume is essentially proportional
to pressure - up to a point, which bottled gas is well below.

If it's oxygen, nitrogen, CO2 or most other gasses then you have a different
problem altogether. Oxygen is fairly linear up to about five atmospheres
(75 psia). Nitrogen and CO2 are not even close and for these you need
either a set of gas tables or a curve fit equation to do the calculations
you are after. >>

Which reminds me, propane and Lng have a very different curve due to low
vapor pressure. I think Freon and some of the other propellant gases have the
similar qualities.

Peter
THRD, Inc.