Thermal equilibrium refers to the condition in which two or more objects in thermal contact reach the same temperature and no longer experience a net transfer of heat between them.

In this state, the rates of heat transfer in both directions are equal, resulting in a uniform distribution of thermal energy.

This concept is fundamental in thermodynamics and is observed in natural and artificial systems, from everyday objects to planets in space, when they attain a common temperature.

What Is Thermal Equilibrium