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Equilibrium (The Zeroth Law of Thermodynamics) Two objects at the same temperature are at equilibrium and remain at equilibrium until the temperature of one of the objects changes. On the other hand, if we put two objects of different temperatures next to each other, one object heats and the other cools until both bodies reach the same temperature. The zeroth law is considered obvious and will not be discussed any further.

The Zeroth Law of Thermodynamics:

Objects at equilibrium must have the same temperatures.


(1) Toossi Reza, "Energy and the Environment:Sources, technologies, and impacts", Verve Publishers, 2005

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