What is meant by thermal equilibrium? - Vidyadip

Question

What is meant by thermal equilibrium?

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Answer

Thermal equilibrium state is that state of a system in which its thermodynamic coordinates, pressure, volume, temperature etc. remain unchanged with time. For example, consider a gas filled in a container with solid insulating walls that is completely isolated from the atmosphere. This system (i.e. gas) is not able to exchange any kind of energy with the environment due to which its pressure, volume, temperature etc. remain constant and the system remains in a state of thermal equilibrium.

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