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>Posted on 30 Oct 1995 at 16:49:47 by Christopher M. Parrett I wrote: >>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 >>-- >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. Forgive me for saying this but I think you are seriously confused about what your program does and how it works. Unless of course it does depend on the tank volume in which case you'll never get within 5% of anything. My whole point is that the true tankvolume is scaled out of *all* equations exactly because your math is purely based on N/V = nxA/nxv=A/v = inverse density. (v being volume per mole and n the number of moles). Now *input* the temperature of the gas in the tank and out comes the pressure. If your program does not work this way please tell us *exactly* how it works and why you think it's correct to do it that way. Now it's possible that knowing the volume of the tank saves you some numeric work in the program but I don't see how. john
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