Is there a critical pressure for melting ice?

AI Thread Summary
Increased pressure on ice favors its transition to water due to the higher specific volume of ice compared to water, leading to a negative slope on the phase diagram. The discussion explores whether there exists a pressure threshold where ice must become liquid regardless of temperature, raising questions about the theoretical limits of this phenomenon. It is noted that high temperature and pressure can create supercritical fluids, but the relationship between pressure and solid phases remains complex. The phase diagram indicates that while supercritical fluids exist, the solid-liquid boundary may curve steeply, complicating the possibility of a solid existing in a supercritical state. Overall, the conversation delves into the intricate behaviors of water under varying pressure and temperature conditions.
Conrad S
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I know the specific volume for Ice is higher than water so increases in pressure make it more favorable for the ice to go to water (hence a negative slope on a phase diagram rather than positive)

Is there a point at which if the pressure was so high that it would be have to be liquid no matter what the temperature was?

Is this even theoretically possible?
 
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I took your question to be
Conrad S said:
Is there a point at which if the pressure was so high that it would be have to be liquid no matter what the temperature was? Is this even theoretically possible?
High temperature and high pressure make a supercritical fluid, with which i have a bit of experience. I'll have to think about a solid.
 
so that kind of opens up another question, so a supercritical fluid is when the the temperature and pressure are above the critical point, but at the top right of the phase diagram there is still a region where there are solids. Is is possible to have a supercritical fluid that is in the solid phase region?
or does that solid liquid line curve up really fast?
 

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