Topic: Thermodynamics
A thermometer works on the principle of
- A. Law of stable equilibrium
- B. Zeroth law of thermodynamics
- C. First law of thermodynamics
- D. Second law of thermodynamics
Answer: B. Zeroth law of thermodynamics
Explanation: A thermometer operates on the principle of the Zeroth Law of Thermodynamics. This law states that if two bodies A and B are each in thermal equilibrium with a third body C (such as a thermometer), then A and B are in thermal equilibrium with each other. This allows the thermometer to measure the temperature of a body by coming into thermal equilibrium with it.