Question

Why does ice floats on water?​

Answer 1

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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. How is ice less dense than water?

So for water, the density actually decreases along with a decrease in temperature - causing ice to be less dense than water!

Answer 2

The mass per unit volume of a substance is called density (density = mass/volume). As the volume of a substance increases, its density decreases.Ice floats because it is less dense than water.Water has a density of 1.0 gm/cubic cm.The density of ice is 0.931 gm/cubic cm.The hydrogen bonds that form when water freezes into ice allow the molecules to be spaced farther apart, making them take more space, decreasing the overall density and making it float in the water.  The water molecules in ice take up about 9% more space than liquid water, which means ice is about 9% less dense than water.