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Anamolous expansion of water

It's a general property of any substance that it expands on heating and contract on cooling but certain substances behave just different way at certain range of temperature. Water  is an example.
Water expands on cooling from 4°C to 0°C or you can say water contracts on heating from 0°C to 4°C.
This unusual behaviour of water is called Anomalous expansion  of water

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