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If same mass of liquid water and a piece of ice are taken, then why is the density of ice less than that of liquid water?

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The molecules are compactly arranged in water whereas in ice the molecule are loosely bound with voids leading to lesser density than water.
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This provides more space between the molecules in the crystal structure ofice than the molecules of liquid water. As a result, ice is less dense than theliquid form. Water is the only known non-metallic substance that expands when it freezes; its density decreases and it expands approximately 9% by v...
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This provides more space between the molecules in the crystal structure ofice than the molecules of liquid water. As a result, ice is less dense than theliquid form. Water is the only known non-metallic substance that expands when it freezes; its density decreases and it expands approximately 9% by volume.

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Specialist in Chemistry.

Because of the hexagonal shape of ice molecule .in case of same amount of water and ice has same mass ice has more Volume as compared to water hence has less density density = mass/ Volume
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