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To: Mike
To: Salmon <m.salmon@ue*.ac*.uk*>
Subject: Re: cryogenic rebreathers
From: Jason Turner <jturner@un*.ub*.ca*>
Cc: techdiver@opal.com
Date: Wed, 22 Mar 1995 10:27:08 -0800 (PST)

On Wed, 22 Mar 1995, Mike Salmon wrote:

> >Christopher A. Brown wrote:
> >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?
> 
For a gas to liquify, its temperature must be lower than its "critical 
temperature".  This temperature is independant of pressure.  For air, 
it's, well, can't remember for sure, and my references aren't handy, but 
it's not much above 100 Kelvins, if at all.  

Hope that helps

Jason
jturner@un*.ub*.ca*

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