Thermodynamic equilibrium
When the property of a system is defined, it is understood that the system is in equilibrium.
If a system is in thermal equilibrium, the temperature will be same throughout the system.
If a system is in mechanical equilibrium, there is no tendency for the pressure to change.
In a single phase system, if the concentration is uniform and there is no tendency for mass transfer or diffusion, the system is said to be in chemical equilibrium.
A system which is simultaneously in thermal, mechanical, and chemical equilibrium is said to be in thermal equilibrium.
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