IGNOU BPHCT 135 2026 - State the zeroth law of thermodynamics. Explain how the zeroth law int

Question

State the zeroth law of thermodynamics. Explain how the zeroth law introduces the concept of temperature.

19 Jan 2026

Answer :

Word Count : 254

The zeroth law of thermodynamics states that if two systems, say A and B, are each in thermal equilibrium with a third system C, then A and B are in thermal equilibrium with each other. This seemingly simple principle forms the foundational basis for the concept of temperature in thermodynamics. Thermal equilibrium implies that there is no net flow of heat between the systems when they are in contact. In other words, systems in thermal equilibrium have the same thermal property, which can be quantified as temperature. By introducing a third system as a reference, the zeroth law establishes a transitive relationship:

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