In article , Richard J Kinch
says...

Charging a compressed gas bottle from a compressor, or from
another, higher pressure bottle, will yeild the same result: the
bottle that is filling will warm up.

One of these two is approximately isothermal, the other approximately
adiabatic.

From my former post:

(quote)
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1) hook the tank up to another, empty tank. Now you have a process
(thermodynamic lingo) where some of the gas at one pressure
transfers over to the empty tank, so you now have a larger
volume at a lower pressure. The first tank cools off (if this
is 'adiabatic', or thermally insulated) and the second one heats
up. If you've ever seen a scuba tank filled you will see that
the second tank heats up. This is an outward sign that there
is work going on - work being done to compress the gas in the
second tank.
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I was saying that in both cases (tank charge, or compressor charge)
the process was defined as adiabatic. I apologize for the confusion.

Jim

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