Question

What is meant by the anomalous expansion of water?

Answer 1

→ When the matter is heated, it expands, and when it is cooled it contracts.

→ However, water behaves in a unique way.

→ When water is cooled from a high temperature it contracts till the temperature is $4°\mathrm{C}$.

→ On further cooling $4°\mathrm{C}$, water starts expanding till $0^{°}\mathrm{C}$.

→ This is known as anomalous expansion of water.

→ During this expansion, the volume increases and therefore the density decreases.