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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.
Ice floats on water as it is less dense than the water, as the water molecules have more energy, because they're in the state of liquid. As ice is in the state of a solid, it is less dense [the particles do not have as much energy as the water], allowing it to float. However, the ice will melt after a while.