# I How does hot ice exist?

1. Dec 13, 2016

### FallenApple

So I've heard that increasing pressure in water would make the molecules more compact and then eventually become a solid. So it's possible to have hot ice.

But isn't it also true that as pressure increases, the temperature increases as well. For example, if I increase the force per volume, the average kinetic energy should increase because the force increased. So in hot ice, the kinetic energy should be higher, so how would it be in a solid form? Perhaps there is something I'm not understanding. Would it just be a vibrating solid?

2. Dec 13, 2016

### rootone

If you compress something it gets hotter, but heat can radiate away.
You then have the compressed something in a denser state, but at it's original temperature

3. Dec 15, 2016

### CWatters

Unlike most liquids water expands when it forms conventional ice but other forms of ice with different structures can exist that are smaller than water.

You can control the pressure and temperature of something independently. What happens is described in a phase diagram (graph of pressure vs temperature)..

4. Dec 15, 2016

### notfrosty

instead of comparing it to ice, imagine it as instead going from water to gelatin to a solid form of gelatin. thats the best I can do to explain it without giving you a headache. you are correct with the fact that as it gets more compressed it would get warmer but the heat would radiate away eventually. leaving you with "hot" ice.

5. Dec 15, 2016