According to the zeroth law of thermodynamics, if two systems are in thermal equilibrium with a third system, they are also in thermal equilibrium with each other. Thermal equilibrium is the state where there is no net flow of heat between objects in thermal contact. This condition is met when the objects are at the same temperature.
Two systems are said to be in thermal equilibrium if and only if :
Asked in UPSC CDS 1 2016 · Topic: Heat and Thermodynamics (Zeroth and First Laws of Thermodynamics (Internal Energy, Work, Heat, Enthalpy))
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