From where does heat energy always move?

Heat energy always moves from a warmer source to a cooler source due to the second law of thermodynamics. This law states that energy spontaneously tends to disperse or spread out unless external work is performed on it. As a result, thermal energy naturally flows in the direction of decreasing temperature until thermal equilibrium is reached.

This principle is evident in everyday life; for example, if you place a hot coffee mug on a kitchen counter, heat will flow from the mug (the warmer source) to the cooler counter, resulting in the coffee gradually losing its heat. Thus, the transfer of heat always occurs in this direction, reinforcing the concept that heat energy moves from higher to lower temperature areas.