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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.
Best Answer: Ice melts at 0ËC, and water freezes at 0ËC. The temperature of the 10 grams of ice does not increase as it becomes 10 grams of water. As heat energy is added to the ice, the structure of the ice changes. In ice, the H2O molecules are arranged in a hexagonal crystal as shown at the website below.