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Re: PV = T


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Posted by Chuck Tribolet on February 23, 2007 at 15:32:28:

In Reply to: PV = T posted by ptf on February 23, 2007 at 11:01:32:

It's not the cylinder that gets warm, it's the gas. The gas in
the banks is at 4000 PSI. The tank will be at 3000 PSI when done.
If we instantaneously transfer the gas, and it's at 68F (20C, 293.15K) in the banks, it will be at (3000/4000)*293.15K = 219.8652K
= -63.91F. COLD.

Now, we don't transfer the gas instantly, it warms up a bit going
through the lines and by absorbing heat from the tank, but I'll bet
the tank is colder than ambient in the 30 second fill case.


Chuck



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