The working principle of a mercury thermometer is ______.

By BYJU'S Exam Prep

Updated on: September 25th, 2023

1. Expansion of matter on heating

2. Change in the mass of matter on heating

3. Change in the density of matter on heating

4. The thermal resistance of matter

A glass tube is filled with mercury and a standard temperature scale is marked on the tube is called mercury thermometer. The mercury expands and contracts with the change in the temperature which can be read from the scale.

Answer: The working principle of a mercury thermometer is the expansion of matter on heating.

It is used in households, industrial applications, and laboratory experiments. If the liquid in the thermometer bulb is silver then it might be a non-toxic compound that looks similar to mercury or mercury. In the event of breaking of a thermometer, it should be disposed properly. It is because mercury vapors are released that are harmful to human and ecological health.

Uses of Mercury Thermometer

Following are the uses of a mercury thermometer:

  • It is used for determining the body temperature.

  • It is used in power plants and piping.

  • It is used in Bakeries and for candy making.

  • It is used in heating and cooling equipment, etc.


The working principle of a mercury thermometer is ______.

Out of the given options, the correct answer is ‘Expansion of matter on heating’.

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