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Heat transfers from hotter objects to colder objects. When an object is at different a temperature from its surroundings, then heat transfer takes place so the body and surrounding reaches the same temperature. Also, heat from a hotter object is transferred to the particles of the surrounding air that are comparatively cooler. For example, when milk is boiled and the flame is off, the milk slowly transfers heat and becomes cooler.

There are three modes of heat exchange:  Conduction, convection and radiation.