Question

When water is heated from $0^{\circ }C$ to higher temperatures, its volume

• A. increases
• B. decreases till $4^{\circ }C$ and then increases
• C. remains the same
• D. first increases then decreases

Answer 1

The correct option is B decreases till $4^{\circ }C$ and then increases

At zero degree water is in its solid form.

As the temperature increases from $0^o$ to $4^o$, we notice that the volume is decreasing. At $4^{o}C$, a given amount of water has the smallest volume that means it has highest density at this point.

If the temperature is bigger than $4^o$, the volume of water will start increasing and as a result the water will be less dense. If the temperature is between $0^{o}C$ to $4^{o}C$, the water will increase in volume and become less dense.