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Hello, As you probably know from my previous mails, I'm currently in phase of building my own home mixing station. During my search I found out very interesting findings about differencies between behavior of ideal and real gas. we all know that this is valid for ideal gas p * V = n*R*T and p1*V1=p2*V2 (if temperature is constant) And on this assumption many of us try to mix their Trimix. 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 when you use this formula for air and you for example calculate amount of air in 10L bottle you will get interesting results: Temp 20Celsius, Air presure 100Bar 150Bar 200Bar volume 880L 1242L 1562L For 200Bar we've got difference appx. 22% which is HUGE difference. That implies to me that using mixing methods based on ideal gas and part. presures are TOTALY useless. 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. 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 ? Regards Jozef Gliviak Slovakia -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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