Talk:Firebending/@comment-75.194.18.96-20120311025002/@comment-4521003-20120322022934

They don't have to change the temperature to turn water to ice. If they compress the water and force it to take on ice's hexagonal internal structure, then the heat would be forced out of the water due to the change without the bender physically removing the heat. Once the water becomes ice it wants to stay that way even once the pressure is removed, and would require enough energy to melt the ice to change it back to water, and it takes a lot of energy to do that because water has a high specific heat capacity. Look up "triple point", and you should be able to find graphs of how matter can change state without changing temperature.