In general, a substance will expand when heated and will srink when cooled, but water has distinctive properties. If the water is heated between a temperature 0°C - 4°C, volume are going shrink. This is because molecules of water in solid form are filled with cavity, while in the form of liquid is dense. Thus, when heated, the molecules of water will be docked first, and as result the volume are shrinking. Therefore, ice is also floating in the water
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