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 > >I got curious about this and looked up the volume of liquid air versus
gaseous 
> >air in my trusty CRC of Chemistry and physics. Liquid air is about 250 times 
> >as dense as gaseous air at 1 atmosphere.
> 
> So how come the air in a 300bar tank is still gaseous?
> 
> mike "physics is not my field" salmon.

Because the "double the pressure, half the volume" ratio doesn't hold at higher 
pressures. It doesn't actually hold at lower pressures but the differences are 
small and are ignored.

At some point increasing the pressure will result in liquification at a given 
temperature. I don't know what that pressure is right off hand for air or O2, 
but it is significantly higher than 300 bar.

If you increase the pressure enough, you can even turn a gas into a metal. 
Researchers have done this with hydrogen in small quantities.

Rick "physics is not my field, either, but they made me take it" Fincher :-)

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