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Date: Thu, 22 Feb 2001 22:18:54 +1100
From: Christian Gerzner <christiang@cc*.co*.au*>
To: "techdiver@aquanaut.com" <techdiver@aquanaut.com>
Subject: Re: More about breathing Helium thermal loss
On Wed, 21 Feb 2001 19:25:38 +0100, mat.voss@t-*.de* (Matthias
Voss) wrote, in response to Jim Cobb:
(snips)

> > On a more practical note, when breathing open circuit, as the gas
> > expands from the tanks to the outlet of the second stage, it cools.
 
> Some gases, like nitrogen, Oxygen, do. They do it within the limits of
> our diving environment. That is, bottle pressure 50 to 200bar, ambient
> pressure from 1 to 15 bar, ambient temperature from zero to 30 °C.
 
> Other gases do not. It is rather fizzical, but there are gases which get
> warmer when they expand , in our kind of settings.

Matthias, I think you mean physical rather than fizzical and usually I
would never point such an error out, especially since English is not
your first language and you write it very well. The unintended pun,
however, is simply irresistible. :-)

Whilst I don't want to get into a debate in which I have precious
little to no knowledge, are these gases which get warmer as they
expand pertinent to diving? After all, you didn't mention what they are.

If not, should we worry about them in a discussion such as this?

Cheers,

Christian
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