First slide

Thermometry

Question

Two thermometers are constructed in the same way except that, one has a spherical bulb and the other a cylindrical bulb. Which one will respond quicker to temperature change ?

Easy

A

spherical bulb thermometer
B

cylindrical bulb thermometer
C

both equally
D

either of any option

Solution

For a given volume, a cylinder has more surface area than a sphere. As rate of heat conduction is proportional to surface area, the thermometer with cylindrical bulb
responds more quickly.

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