What is thermal equilibrium? | Definition

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Definition of thermal equilibrium: 


Two physical thermodynamic systems are in thermal equilibrium when there are variations in temperature from point to point of an isolated system. OR If there is no net thermal energy flow between them, when connected by a heat-permeable pathway. When there are no further changes are observed, the system is said to be in thermal equilibrium. 

Thermal equilibrium performs on the zeroth law of thermodynamics. 

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