Le_Forgeron <jgr### [at] freefr> writes:
> the case of the sea water (rather 3 to 4%)), but 2 seems bogus: when
> pression increases, the states move from gas to liquid to solid (unless
> you are on the diagram part where liquid is gone away... well there is
> also a part of high pressure where liquid and gas are not separate...
> for high temperatures).

Actually, when external pressure increases, the melting point of water
goes down:

http://en.wikipedia.org/wiki/File:Melting_curve_of_water.jpg

Here's one explanation. Not 100% sure it's correct:

http://www.physlink.com/education/askexperts/ae132.cfm

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