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Re: CO2 phase term
Aquatic Plants Digest wrote:
> From: ChuckW7160 at aol_com
> Subject: re: CO2 phase term
> I believe the term you are looking for is sublime. If i'm remembering right
> when a substance goes directly from solid to gas, or gas to solid skiping the
> liquid state it is said to sublime. can't exactly call the act of dry ice
> going straight to gas melting :) that would imply a liquid state.
Right. And the diagram of a substance's phases includes both pressure
and temperature as the axes. So at some pressures (higher than
standard) CO2 does exist as a liquid - as in your compressed cylinder.
What I don't recall from basic chemistry is if all substances have a
sublimation point at some low pressure. Also, what governs how much of
a substance (snow for instance) melts and how much sublimes if both are happening?
Christopher L. Weeks