Question

Why density of ice is less than water. explain

Answer 1

The density of ice is 0.9167 g/cm3 at 0 C, whereas water has a density of 0.9998 g/cm at the same temperature. Liquid water is densest, essentially 1.00 g/cm , at 4 C and becomes less dense as the water molecules begin to form the hexagonal crystals of ice as the freezing point is reached.


in simple words,It's the Volume which is directly proportional to the weight of substance. 


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Answer 2

ice is less denser than water because orientation of hydrogen bonds cause molecules to push farther apart which lowers the density when water freezes water molecules from a crystralline structure maintained by hydrogen bonding