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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.
1 When water freezes, water molecules form a crystalline structure maintained by hydrogen bonding. 2  Solid water, or ice, is less dense than liquid water.  Ice is less dense than water because the orientation of hydrogen bonds causes molecules to push farther apart, which lowers the density.