> Alain<aze### [at] qwertyorg>  wrote:



>
>    So, does water freeze or melt at exactly 0 degrees celsius?
>
At sea level, yes. Melt if you add energy, freeze if it looses energy, 


As you climb or reduce presure, the freezing point slowly climb, but not 
much.
As you go lower or increase presure, the freezing point goes into the 
negative.

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