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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 >-- >Send mail for the `techdiver' mailing list to `techdiver@terra.net'. >Send subscription/archive requests to `techdiver-request@terra.net'. > > The basis of our math is MOLE volume based. Thus the true volume of the cylinder is VERY important. But, give or take 1/2 cubic inch, probably won't make a huge differance. Christopher M. Parrett, President, Abysmal Diving Inc. Makers of ABYSS, Advanced Dive Planning Software. 6595 Odell Place, Suite G. Boulder CO, 80301 Ph, 303-530-7248, Fx, 303-530-2808 ftp://abysmal.com/users/abysmal http://www.emi.net/gulfstream/abyss/abyss.html
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