Quote:
Originally Posted by Moontanman
Evaporation is important but you have left out a big part of the puzzle. Heating water drives out all the dissolved gasses. Dissolved gasses act like antifreeze driving the freezing point down making it harder to freeze water that contains the gasses. Heated water not only cools fast it also freezes closer to the freezing point of pure water.
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right that's why if you were to boil the water, evaporating most of the minerals in the water to get it closer to H20.