# Thread: Water properties under pressure

1. Hey all. I was just sitting on my couch and thinking of stuff to ask my science teacher when i get back to school, seeming i normally ask him whacky stuff. Then it hit me. What happens to water if it doesn't have enough space to freeze? Say if we filled a container with water, but the container was able to withstand the outgoing pressure of the water trying expand to freeze. What would happen to the water if it was cooled down to below freezing temp, because it has no room at all to freeze, does it stay in a liquid state, or does the ice just become denser?

Also on this point, if you pressurise water enough, does it become ice? ^^

(Couldn't find any answers on the interwebs ): )

2.

3. You need to search for a "phase diagram" for water. This shows you the different states that water can be in at different temperatures and pressures. Under the circumstances you are suggesting, I think it would become a different form of ice (the phase diagram of water is pretty complicated as it has several solid forms).

4. Thanks a lot ^^

5. This curve shows that for a given temperature, if you raise the pressure, ice melts. As the temperature decreases the melting pressure increases. I think what would happen if you didn't let the ice expand, the pressure would go up and the water would stay liquid. Eventually at a low enough temperature the water would freeze into one of the high pressure forms of ice that is denser than water.File:Melting curve of water.jpg - Wikipedia, the free encyclopedia

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