Question

explain the Anomalous expansion of water

Answer 1

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Answer 2

The anomalous properties of water are those where the behavior of liquid water is entirely different from what is found with other liquids. As a gas, water is one of lightest known, as a liquid, it is much denser than expected and as a solid, it is much lighter than expected when compared with its liquid form.
The anomalous expansion of water refers to the fact that water, unlike most substances, expands when it freezes. The density of water increases as temperature decreases, but reaches a maximum at 4 degrees C then begins to expand. The significance of this is that ice is less dense than water so it floats in water.