Question

principle of thermometry

Answer 1

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The basic principle of thermometry is that when the two bodies in contact and in thermal equilibrium will have the same temperature.


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Answer 2

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Here is your answer,

Physical property change of thermometric material is linearly related to temperature change.

A known measure of liquid (mercury, alcohol, or a hydrocarbon-based fluid) is vacuum-sealed in a glass tube.

The liquid expands or contracts when air is heated or cooled.