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At 07:16 AM 2/21/01 -0800, Esat Atikkan wrote:
>the short answer is from the stndpt of respiratory He
>loss, He breathing will, theoretically, use less body
>heat.
>
>Safe bubbles
>Esat Atikkan

Another short answer is that when you breathe a gas the thing you want to 
know is the cost of heating it rather than how well it conducts heat. 
Helium costs less to heat but it's a terrific heat conductor. The latter is 
irrelevant for breathing since every "lungful" is heated to body core temp 
before you exhale it anyway. But then, it's very relevant for suit 
inflation since, in this case,  the heat sink is the ocean and the  gas is 
just a mediator.

Hans


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