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Re: [APD] CO2 and sublimation
H2O too can pass from, for example, solid to vapor, which
property is used to advantage in the freeze dry process.
The tank pressure prevents the CO2 from behaving like a gas
at CO2 tank temps -- well some in the tank is gas and some
liquid. But there is just too much kinetic energy for the
CO2 molecules to line up and stay lined up. If you gave the
compressed CO2 more room, which one does when one releases
it from the tank, it happily performs quite gaseuosly.
That's not the whole story and probably briefer than most
chemist would like.
--- Rory O'Brien <rory_obrien at stonebow.otago.ac.nz> wrote:
> I remember being told in school that CO2 was unusual in
> that it sublimes -
> goes directly from a solid (dry-ice) to a gas without an
> intermediate liquid
> So what are we putting in our CO2 bottles?
> I presume its the bottle pressure that allows a liquid
> - R.
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