Thanks Duane.
I realized my error with the ice cream thing this
morning (nothing like swimming 1000 meters to let your
mind wander).  Its the old phase change/energy
transference that we got to know and love in
thermodynamics (my father in law calls it
thermo-goddammits).
Anyway, thanks again for all the ideas.  I also
appreciated the feedback about moisture content of the
breathing gas.
Wendell G

--- Duane Liptak Jr <d.liptak.jr@wo*.at*.ne*>
schrieb: > Nope.  The ice cream thing is based on the
melting
> action and the ability of
> salt to lower the freezing point of water.  Ice at
> 32F and ice water at 32F
> are both 32F, but it requires heat for the change in
> state from solid to
> liquid.  The heat energy used in melting is drawn
> from the cream--The
> freezing process gives off heat--thus the heat
> necessary for melting the ice
> comes from the freezing of the cream.
>      However, the salt in seawater (or ice cream
> brine) also lowers the
> freezing point, creating a situation where liquid
> saltwater can exist at
> below 32F.  Regs would be no more likely to freeze
> on this basis in
> saltwater at 32F than freshwater at 32F.  But, regs
> would be slightly more
> likely to freeze due to moisture in the breathing
> mixture if the seawater
> were 31F versus 32F freshwater simply because of the
> temp difference.
> 
> Anyway, it's something like this.  It's late, and my
> memory of the laws of
> thermodynamics may be a bit sketchy, so if there's
> an MIT grad out there who
> can correct any flaws in my explanation, go for it.
> 
> I'm suddenly very hungry for ice cream.
> 
> S/F,
> Duane
> 
> Ergo the query... recalling what us old farts used
> >to do to make ice cream at home- mix rock salt and
> ice to make a slushy
> >brine and then use that to surround and "super
> cool" the cream inside
> >the container.  Does the same principle apply in
> diving- i.e..  a salt
> >water solution at 0 C is going to be able to
> conduct heat away from the
> >reg more efficiently than a fresh water solution at
> 0 C and therefor
> >make you more susceptible to freeze up?
> 
> 
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> 


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