The zeroth law of thermodynamics allows us to define

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The zeroth law of thermodynamics states that if two bodies are each in thermal equilibrium with a third body, then they are in thermal equilibrium with each other. This allows us to define and measure temperature, which is a measure of the average kinetic energy of particles in a substance. It also allows us to identify when two objects are at the same temperature and therefore in thermal equilibrium with each other.

The Zeroth Law of Thermodynamics Allows Us to Define