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In a message dated 9/29/98 9:11:40 AM Eastern Daylight Time,
joelsilverstein@wo*.at*.ne* writes:

> A major problem associated with the use of helium is body heat loss, which
>  is caused in part by the fact that the thermal conductivity of helium is
>  approximately six times that of air.  Helium has a higher thermal
>  conductivity than nitrogen, but because of its lower density has less
>  thermal capacity; its thermal properties make it unfavorable in cases where
>  it is used inside a diving suit.  Helium is a very poor insulator.  
>  


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It was my understanding that most of the heat loss by reparation was due to
evaporation of water from the lungs into the inspired gas - Heat of
vaporization?

I don't have the address at hand but check out "Why Argon" by Eric Maiken for
some related heat transfer stuff  (I think he might address this
specifically).    Maybe someone else could point the way to his Web site.

Chuck Boone
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