Zeroth law of thermodynamics

Mechanical Engineering

Zeroth law of thermodynamics:

It states that when two systems have equality of temperature to a third system, they in turn have equality of temperature with each other.

e.g. Suppose three are three bodies A, B and C. If body A has the same temperature as that of B and C then bodies B and C will also have the same temperature. It means that all the three bodies are in thermal equilibrium.