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I am interested in this thread as I always thought that you lost more body heat
using helium

"Helium is indeed more conductive than nitrogen, which is why it should not be
used as a suit gas.  However, conductive heat loss through the lungs is
actually less with helium, as the heat capacity of helium is lower than
nitrogen."

Can you tell me the relationship between Specific Heat capacity and conductive
properties? 

Looking at the above comments I don't understand why you get more conduction
using helium as a suit gas but less when you are breathing it (granted that you
would be using 100% for the suit and a lower % as part of a breathing gas).

Interested in your comments.

James Dibbs
Sydney, Australia
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