When water is cooled down to 0°C, its tempesature remains
constant for some time. (G.S.R.)
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When water is heated from 0 0C, its volume decreases because its density increases and you can see this effect upto 4 0C. Because the density of ice is maximum at 4 0C. Afterwards as the density decreases the volume increases. The main reason for this is hydrogen bond in ice gets cleaved due to the melting of ice.:
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