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You need to understand that the relationship between density, mass, and volume is expressed as D=m/V.

Water is one of the few liquids that expands when it is cooled. Water is at its lowest density (maximum expansion or volume) at 3.98°C which is just above freezing. Therefore cold water is less dense than hot water as a result of the hydrogen bond.

If you don't believe that, try floating an ice cube on water of any temperature.

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