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Why ice is lighter than water? Hydrogen bonding gives ice a rather open structure with wide holes. Thus for same volume of water and ice , ice has less mass so it is lighter than water.
Why Ice Floats. A substance floats if it is less dense, or has less mass per unit volume, than other components in a mixture. For example, if you toss a handful of rocks into a bucket of water, the rocks, which are dense compared to the water, will sink. The water, which is less dense than the rocks, will float.