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wrote:
George E. Cawthon wrote:

ISTR that CO2 will liquify under pressure at room temperature.

It won't condense into liquid at atmospheric pressure though,
goes straight to solid.

Water does the same, gas to solid, solid to gas (sublimation)
with no liquid phase at very low presssure.

Actually that isn't true.

Sure it is. Water does just that.

The properties of water
are quite different from those of carbon dioxide.
Sublimation of water also occurs at normal
atmospheric pressures.

I didn't say that water could did sublimate at normal atmospheric
pressure. The vapor pressure of water over ice is non zero, same
as for a lot stuff.

I know you didn't. You should have.

I said water goes gas to solid and solid to gas (sublimation)
with no liquid phase at very low presssure, which is true.

Not true, doesn't have to be very low pressure.
It happens all the time at atmospheric pressure.

Carbon dioxide does the same, at atmospheric pressure, gas to
solid, solid to gas, with no liquid phase.