Quote:
Originally posted by Peetster
Water freezes at 32F at one standard atmosphere. Increase the pressure and the freezing point goes down. Water at the bottom of the ocean can be significantly colder than 32.
Interestingly, there is a point along the temp/pressure scale where all three forms can exist simultaneously: solid ice, liquid water and water vapor (steam).
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You're right about the pressure.
And as an aside, water at the surface of the ocean can be below 32 and not be frozen as well. The freezing point of salt water is dependent upon the amount of salt in solution. If the water was to hold as much salt as possible (you put more salt in and the salt remains crystaline) the freezing point is somewhere below zero.