Will water at low pressure still freeze at zero degrees?

chris · « **on:** 31/01/2023 11:58:52 »

Water under a lower pressure boils at a lower temperature because the lower pressure makes it easier for molecules to gain sufficient energy from the liquid to sever the intermolecular forces within the fluid and escape as a vapour. But what happens to the freezing point?

Bored chemist · « **Reply #1 on:** 31/01/2023 12:55:48 »

At a reduced pressure the freezing point rises slightly. (At most, roughly 0.01 degrees C)
For most materials (those which contract on freezing) the freezing point would reduce .

It's an example of this
https://en.wikipedia.org/wiki/Le_Chatelier%27s_principle

vhfpmr · « **Reply #2 on:** 31/01/2023 13:03:05 »

https://naeye.net/wp-content/uploads/2021/01/water_phase_diagram.jpg

chris · « **Reply #3 on:** 02/02/2023 17:08:53 »

Dare I ask why this phenomenon occurs?

Bored chemist · « **Reply #4 on:** 02/02/2023 18:28:10 »

Quote from: chris on 02/02/2023 17:08:53

Dare I ask why this phenomenon occurs?

Apparently.
And to an extent the answer is

https://en.wikipedia.org/wiki/Le_Chatelier%27s_principle

alancalverd · « **Reply #5 on:** 03/02/2023 09:24:11 »

Fun news item this morning. Apparently University College London have made (or discovered) a disordered state of ice by milling the regular stuff into a glassy solid with a density of 1.0.

Will water at low pressure still freeze at zero degrees?

chris (OP)

Will water at low pressure still freeze at zero degrees?

Bored chemist

Re: Will water at low pressure still freeze at zero degrees?

vhfpmr

Re: Will water at low pressure still freeze at zero degrees?

chris (OP)

Re: Will water at low pressure still freeze at zero degrees?

Bored chemist

Re: Will water at low pressure still freeze at zero degrees?

alancalverd

Re: Will water at low pressure still freeze at zero degrees?

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