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There seems to be some confusion here. The polarity of water comes from an skewness in the electric charge distribution of electrons in the water molecule,
which has nothing to do with temperature.

What I think the question refers to is water density.
It just so happens that the maximum density of water is at about 39 degrees Fahrenheit.
This is easy enough to observe. Principally you could just pour up cold water in a measuring glass and heat it up. The volume will then change.
At 4 degrees celsius (about 39 F) water has a density of 999.9720 kg/m^3
while it has a density of 983.2 kg/m^3 at 60 degrees celsius.
At 0 degrees, it has been measured to 999.8395 kg/m^3, so at 4 degrees
it has the highest density of these measurements.

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15y ago

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