Question

In anomalous expansion of water, at what temperature the density water is maximum?

• A. $<9^{\circ }\text{C}$
• B. ${10}^{\circ }\text{C}$
• C. $>4^{\circ }\text{C}$
• D. $4^{\circ }\text{C}$

Answer 1

The correct option is D $4^{\circ }\text{C}$

For water, volume versus temperature curve is


We can see, volume is minimum at $4^{\circ }\text{C}$ hence density is maximum as density is inversely proportional to volume.
$\text{Density}=\frac{\text{Mass}}{\text{volume}}\Rightarrow \text{Density}\propto \frac{1}{\text{volume}}$