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the process whereby heat moves from one body or substance to another by radiation, conduction, convection, or a combination of these methods
Heat transfer flows from a body with high energy (higher temperature) to lower energy (lower temperature).
any or all of several kinds of phenomena, considered as mechanisms, that convey energy and entropy from one location to another. The specific mechanisms are usually referred to as convection, thermal radiation (qq.v.), and conduction (see thermal conduction). Conduction involves transfer of energy and entropy between adjacent molecules, usually a slow process. Convection involves movement of a heated fluid, such as air, usually a fairly rapid process. Radiation refers to the transmission of energy as electromagnetic radiation from its emission at a heated surface to its absorption on another surface, a process requiring no medium to convey the energy.