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2014-09-30T22:07:12+05:30
Density=mass/volme .since the volume occupied by samequantity of ice is morethan that of water so ice have alower density
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2014-10-02T16:43:59+05:30

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When a liquid is solidifying, normally the molecules come closer and form some crystalline structure with stronger and more rigid bonds among the molecules. So the closely packed structure has higher density and occupies less volume for the same mass.

In case of water it is different. This is due to the strong hydrogen bonds. When water is frozen, the hydrogen atoms seem to repel other hydrogen atoms in the neighboring molecules. So the molecules move away a little more than in water. The crystalline structure of ice has hydrogen atoms separated by more distances and so density is less than that of water.

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