Thermodynamics equilibrium : A system in which the state variables have constant values throughout the system is said to be in state of thermodynamics equilibrium.
The criteria for equilibrium :
1) The temperature of the system must be uniform and must be same as the temperature of the surrounding (thermal equilibrium).
2) The mechanical properties of the system must be uniform throughout the system (mechanical equilibrium). That is no mechanical work is done by one part of the system on any other part of the system.
3) The chemical composition of the system must be uniform with no net chemical changes (chemical equilibrium).
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