Question

When water freezes it density becomes less so that's why ice floats on water??

Answer 1

Ice floats because it is about 9% less dense than liquid water. In other words, ice takes up about 9% more space than water, so a liter of ice weighs less than liter water. The heavier water displaces the lighter ice, so ice floats to the top.

Answer 2

However, the ice expands in volume. This expanse is a result of air trapped between the frozen molecules.Therefore the ice is provided with upward force as the volume of water is more than that of ice.So, by archimedes principle ice floats on water.