Believe it or not, ice is actually about 9% less dense than water. Since the water is heavier, it displaces the lighter ice, causing the ice to float to the top.

Does frozen water sink or float in liquid water?

Explanation: For most substances, the solid (frozen) phase is the most dense and will sink in the liquid phase. However, solid (frozen) water (ice) floats on liquid water. ... This increases the volume of the water, so it is less dense than liquid water.

Why does ice sink in liquid water?

Ice floats because it is less dense than the water. Something denser than water, like a rock, will sink to the bottom. ... As water cools and freezes, it becomes less dense due to the unique nature of hydrogen bonds.