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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.
Structured water has higher specific refraction and refractive index for its density but the effect of density changes on the refractive index outweighs that of the specific refraction differences due to water structuring; thus, ice has a density of 91.7% of water and refractive index of 98.2% of water.