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  4. Assertion: The density of water remains constant as it is cooled from room temperature until its temperature reaches 4°C. Reason: Below 4°C, the density increases.

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Q. Assertion : The density of water remains constant as it is cooled from room temperature until its temperature reaches $4^{\circ}C$.
Reason : Below $4^{\circ}C$, the density increases.

Thermal Properties of Matter

Solution:

The volume of water decreases when water is cooled from room temperature, until its temperature reaches $4^{\circ}C$ and hence density increases. Below $4^{\circ}C$, the volume increases and therefore, the density decreases.