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The density of water increases to a maximeum at about 4 degrees Celsius. AsAssuming that Hewitt got his data right, I would guess that if the
the temperature continues to decrease, the density decreases. Hence ice
floats in water. However, if one believes the volume versus teperature curve
as shown in Hewitt, then one must believe that the density of hot (above 20
degrees celsius) is less than that of ice. Why, then, does ice float in very
hot, nearly boiling, water?