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Use of thermometer is based on which law of thermodynamics?

1. zeroth
2. First
3. second
4. Third

Correct answer: zeroth

Solution

A thermometer measures temperature by reaching thermal equilibrium with the object. The zeroth law of thermodynamics states that if two systems are each in thermal equilibrium with a third system, then they are in thermal equilibrium with each other, which is the basis of temperature measurement.

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