On Mon, 05 Sep 2011 13:17:32 -0400, Warp wrote:

> Alain <aze### [at] qwertyorg> wrote:
>> Pure water at average sea level presure boils/condense at 100°C and
>> melt/freeze at 0°C at the same presure level. Both by definition. In
>> fact, it's the definition of 0°C and 100°C.
> 
>   So, does water freeze or melt at exactly 0 degrees celsius?

Yes, at some altitudes, it does.

Jim

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