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Subject: Re: ice in a vacuum

Date: 03/24/03 at 6:38 PM
Posted by: Robin Whyte
E-mail: recalvac@AOL.COM
Message Posted:

In Reply to: ice in a vacuum posted by paul styler on 03/24/03 at 5:41 AM:


Water in a vacuum will start to boil at 68F
when a vacuum of 23.4 mbar or 18 torr is reached.
As long as any water exists at room temperature
anywhere in a vacuum system,the minimum pressure
attainable in the system will be 23.4 mbar or 18 torr ( this is called the saturated vapour pressure).

A little water will produce very large volumes of vapour,and can take a long time to pump away.

Note that rapid evaporation will result in a lowering of the tempreture of the water ( unless
heat is applied ) and it will freeze.

At 32F the saturated vapour pressure of ice is about 6mbar or 4.5 torr.

I hope this answers your question
Robin


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