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>I have access to "the CRC handbook" for chemical engineers & looked up a table
>showing various conductive values for gasses.  This table shows that, at room
>temperature, argon gas will conduct 41cal/sec, air conducts about 60cal/sec,
>and carbon dioxide gas conducts 35cal/sec (the lower the value - the
better the
>insulator).  Has anyone tried CO2 gas to fill a suit?  This  seems to be a
much
>more economical solution to keeping warm...

Dennis, the problem is that the drysuit is not perfectly dry.  There is
always going to be some moisture in there.  Water + CO2 makes H2CO3,
carbonic acid.  While a weak acid, not in the same league with, say HCl or
H2SO4, it ain't inert, and you probably don't want it on your drysuit or
your skin.
--
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