Question

How does the density of water changes when:
(a) it is heated from $0^{\circ }C$ to $4^{\circ }C$,
(b) it is heated from $4^{\circ }C$ to ${10}^{\circ }C$

Answer 1

(a) Water contracts on heating from $0^{\circ }C$ to $4^{\circ }C$ and expands on heating above $4^{\circ }C$.
(b) The density of water is maximum at $4^{\circ }C$ . It decreases when it is cooled from $4^{\circ }C$ to $0^{\circ }C$ or it is heated above $4^{\circ }C$