Question

why ice float on water

Answer 1

Ice floats on water because it's density is lesser than that of water. (1g/cubic cm)

Answer 2

Question

why ice float on water

Answer

The important phenomenon of floating of ice over water is because of hydrogen bonding. The density of ice at 0°C (0.917 g/cm³) is less than that or liqurd water at 0°C (1.00 g/cm³). In the liquid state water molecules move randoimy.However, when water freezes, the molecules arrange themselves in an ordered form, that gives them open structure.

This process expands the molecules, that results in ice being less dense as compared to water.