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'[OT: ] Wet Mars'
2004\03\03@043853 by Howard Winter

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Russell,

On Wed, 3 Mar 2004 18:02:10 +1300, Russell McMahon
wrote:

> If something flowed it was liquid water. The
alternative fluid is liquid CO2 and that's far far less
likely.

Errr - if I remember my schoolboy chemistry correctly,
CO2 goes straight from solid to gas (and vice-versa),
doesn't it?

Cheers,

Howard Winter
St.Albans, England

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2004\03\03@050629 by Russell McMahon

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> > If something flowed it was liquid water. The
> alternative fluid is liquid CO2 and that's far far less
> likely.

> Errr - if I remember my schoolboy chemistry correctly,
> CO2 goes straight from solid to gas (and vice-versa),
> doesn't it?

On earth at atmospheric pressure - yes.
CO2 solid "sublimes" directly to gas.
Whether you get liquid CO2 depends on pressure and temperature.
Take a CO2 cylinder for eg a soft drink dispenser ("Soda Flow" in this
country) and shake it. The liquid you hear / sense is liquid CO2 at around
800 psi.

Mars is even less likely to support liquid CO2 - as I implied. .


   RM

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2004\03\03@054853 by Roland

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>Errr - if I remember my schoolboy chemistry correctly,
>CO2 goes straight from solid to gas (and vice-versa),
>doesn't it?
>

Only in our atmosphere, called sublimation. It has a liquid phase, like any
other gas.

Reagards
Roland



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Regards
Roland

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