Density involves the amount of a material in a certain volume. When a material changes phases, it changes in density in a predictable way as the amount of material stays the same but the molecules get farther apart or closer together. Water has solid and liquid states that do not follow these predictions of density in the phases of matter. What does that mean about the densities of the phases of water?
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it is very mysterious property of water(&helium also) that solid state of water(ice) is less dense than liquid state of water this is why ice floats on water this anomalous behaviour is due to structure of ice the structure of ice is cage like bonded by hydrogen bonding these cage like structures traps air in them and increase the volume thus it doesnot tends to follow the general trend of increase in density while going from liquid to solid state of matter
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