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Hi Jeff & others,

Damn, I forgot to put the legends on that graph: The various curves are 
AIR at different temperatures: From down on up they're 270 K, 280 K, 
290 K, 300K,and 350 K, or -3deg C, +7deg C, +17 deg C, +27 deg. C, 
and +77 deg C. I don't have a Fahrenheit scale handy, but you can do 
the transforming. Sorry about that. I hope this clarifies things up a 
bit

On helium, the compressibility factor at 100 bars/17deg C is ~5%, and
at 150 bars/17deg C ~7%, i.e. *more* than air. This, I think, has to do 
with ideal gas law basics. With compressed helium, you have lots of 
hard collisions, which you're not supposed to have in an ideal gas. In 
addition to Sychev et al. on air, there's more books for all gases. I'll be 
back with those references as soon as I get them. Now, mixing these
gases, that's another thing..

I'll put that graph up once more, now that you have the curve 
legends. Good dives,

Juha

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