Question

at what temperature the density of water is maximum ? state its value

Answer 1

Density of water is maximum at 4 °C. It's density is 1kg/m^3 at 4 °C.
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Answer 2

4 degrees C turns out to be the temperature at which liquid water has the highest density. If you heat it or cool it, it will expand. The expansion of water when you cool it to lower temperatures is unusual, since most liquids contract when they're cooled.