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

> 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.

Let me know what the gas is and what pressure you are dealing with and I
will look for the numbers. I did some work on gas equations for NIST years
ago and might still have some of the data. At worst, I could look it up in
the gas tables.

Doug