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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.
All of these are gases and yet have much higher molecular weights than water does. However, none of these can hydrogen bond, and that is why they are gases, whereas water is a liquid. Of course, at high temperatures water is a gas (steam) and at low temperatures water is a solid (ice). See the Web Links for more information about intermolecular forces. Why is water at room temperature a liquid?