On 29 Sep 2006 15:09:02 -0500, T o d d P a t t i s t
wrote in
:

Was your conclusion that it was this reduction in
velocity that resulted in the increase in temperature?

No, it was that the velocity goes from organized flow to
random thermal energy.

I haven't read the entire thread, but does the analysis that lead to
your conclusion include the heat transfer from the ambient atmosphere
through the conductive copper fill tubing to the O2 between the
reservoir tank and the tank being filled? The temperature
differential between the gas leaving the reservoir tank and the
ambient air must be pretty significant, so I would expect the heat
transfer to figure in your conclusion. Of course the amount of time
the O2 being transferred is exposed to ambient temperatures is also a
factor. How long does it typically take to complete the filling
operation?

You mentioned ignoring the temperature of the residual gas (at one
atmosphere pressure) contained in the bottle you are filling because
it was insignificant, but if the gas flowing into the bottle is
picking up heat as it is transferred, and then being compressed to a
higher pressure as the bottle fills, it seems its temperature would
rise.