You can freeze water by heating it? apparently

[wickedsingh]

Well i am doing my physics investigation about temperature, and need an interesting effect that takes place at a precise temperature. I remember watching this thing ages ago on discovery. It was about mining and they needed large quantities of ice. So instead of making it by the normal process they did it another way.

There was this huge machine that looked like a mixer. I think it was under high pressure aswell, or it might be low pressure, and they said the ice was made by heating water and doing something to it. As you can see i recall very little. I think it was called the double point of water or something similar.

Does anyone know about this? Please help

 

[mapper]

heating the water to distill it and make it more pure so it has a lower freezing temp?

 

[hexhunter]

if you compress water enough, will the molecular structure break and reform as a very thick ice?

 

[Andrew Mason]

Well i am doing my physics investigation about temperature, and need an interesting effect that takes place at a precise temperature. I remember watching this thing ages ago on discovery. It was about mining and they needed large quantities of ice. So instead of making it by the normal process they did it another way.

There was this huge machine that looked like a mixer. I think it was under high pressure aswell, or it might be low pressure, and they said the ice was made by heating water and doing something to it. As you can see i recall very little. I think it was called the double point of water or something similar.

When you put greater pressure on ice (as in skating) it melts. That is very important in skating and curling, for example - and in driving on snow near 0 deg. C.

Conversely, when you reduce pressure on water at 0 degrees, it freezes more rapidly. If you can't get the temperature of water down below freezing, just reduce the pressure enough and it will turn to ice. When you reapply normal pressure, it will start to melt but the latent heat of water means that it will not melt immediately.

AM