heat: Transfer of Heat
Heat may be transferred from one substance to another by three means— conduction , convection , and radiation . Conduction involves the transfer of energy from one molecule to adjacent molecules without the substance as a whole moving. Convection involves the movement of warmer parts of a substance away from the source of heat and takes place only in fluids, i.e., liquids and gases. Radiation is the transfer of heat energy in the form of electromagnetic radiation , principally in the infrared radiation portion of the spectrum.
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