Darren New schrieb:
> clipka wrote:
>> I was indeed slightly mistaken: The original definition was for water 
>> at the /melting point/, which is a bit above 0 degrees C (something 
>> like 0.01 degrees C, IIRC).
> 
> I think the 4C was because that's the temperature at which liquid water 
> is most dense.

Not exactly: They moved to 4 degrees C because it is the temperature at 
which the density is /most stable/, so the influence of getting the 
temperature wrong is minimized.

(Though of course this is closely related to the fact that at 4 degrees 
C water is most dense, too.)

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