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I have heard that a breath of Helium feels like a cold draft because it has a
higher heat transfer rate, as John Crea's numbers show. It would draw heat
faster from the lungs than air, but only for an instant since it does have a
lower heat capacity and ends up absorbing less heat in the end. I have never
had a breath of trimix, but this sounds reasonable to me. This could certainly
add to psycosomatic cold. I'm never cold once I stop thinking about it, but if
I were reminded every breath....

Roger

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