Thermal Equilibrium

Two bodies at different temperatures come in contact with each other, the heat flows from the body at higher temperature to the body at lower temperature until they attain the same temperature. The branch of physics which deals with the perceptions of heat and temperature and the inter conversion of heat into work is known as thermodynamics.  At thermal equilibrium, the temperatures of the two systems are equal.
Adiabatic wall is an insulating wall that does not allow heat transfer through it. Diathermic wall is a conducting wall that allows heat transfer through it.
Zeroth Law of Thermodynamic states that, two systems in thermal equilibrium with a third system separately are in thermal equilibrium with each other.

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