Suppose that you have a really deep body of fresh water - which has
actual temperature of 3,98 Celsius near surface, below a thin layer of
surface ice and a thin layer of water colder than 3,98 degrees.
As water is lowered from the surface, its density increases
(compression). But adiabatic compression should cause some increase of
actual temperature, even in liquids and solids.
The melting point decreases up to about 2200 atmospheres (ice Ic),
then begins to rise. Ice VI forms at about 6000 atmospheres, and
actual temperature of about 0,16 Celsius. It is denser than water, and
naturally its freezing point increases with pressure.
At which temperature and pressure would ice VI come to equilibrium
with fresh water adiabatically compressed from 0 atm 3,98 Celsius?
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