Two mercury thermometers are constructed such that one has a spherical bulb and the other an elongated cylindrical bulb of same volume. Which will respond quickly to temperature changes?

Spherical bulb.

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Elongated cylindrical bulb.

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Both will respond equally.

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It is independent of the shape of the bulb.

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Solution

The correct option is B
Elongated cylindrical bulb.

As we know that a sphere has the least surface area for a given volume. So obviously cylindrical bulb has a greater surface area than a spherical bulb of the same volume. Hence, the latter thermometer will respond to temperature changes more quickly than the former.

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