About physics.
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Tauhid
unless people interfere, thermal energy — or heat — naturally flows in one direction only: from hot toward cold. Heat moves naturally by any of three means. The processes are known as conduction, convection and radiation. Sometimes more than one may occur at the same time.
AM Nabil
Heat always flows from a hot place to a cold place when flowing spontaneously, but you can force heat to flow the opposite way by using energy.