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On Sun, 9 Jan 2000, Gliviak, Jozef wrote: > But based on Van der Waals findings for real gas it looks like this in > reality > > (p+ (n*n*a/V*V))*(V-nb)=nRT > > where a,b are gas dependent constants Actually, Van der Waals is only one of many ways to _approximate_ the behavior of real gasses. And it is not the most accurate for temperaures and pressures of interest to us. > Using oxygen analyser we are able to check and adjust amount of oxygen > quite sharp, but we've got no clue how much Nitrogen and Helium is in > the mix. Knowing these to within a few percent is not neccessary. > So I'd like know, if you are using this method. If not, which method > do you use? If yes, how you deal with these differencies between > assumptions and reality? It seems the usual approach, and one that makes sense, is to apply a "fudge factor". Just increase the fill pressure for the He from the ideal by about 10%, and you'll be close enough. The increased computational complexity imposed by any of the real gas approximations is just not worth the effort. -- Art Greenberg artg@ec*.ne* -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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