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>Posted on 30 Oct 1995 at 14:38:25 by Christopher M. Parrett

>>Ken wrote:
>>Aren't you forgetting something REALLY important? What about minute
>>differences in tank volume. I realize it might seem trivial, however
>>under extreme pressures these minute differences can add up.

>The minutia could creep up on us.

This cannot be correct.  When you fill on pressures the volume
of the tank is irrelevant.  Imagine filling two independent tanks
simultaneously from two independent banks of gas.
The pressures in the two are identical.  If you now hook
the two tanks up with a manifold and fill from one bank only
the mixes during the second fill are identical to that of the
first fill if the pressures "track" (and the temperatures
are kept the same).

In summary, the corrections to the ideal gas law (for which
partial pressures can be defined) depend on the density and
*not* the volume.

john

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