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Convective heat transfer, often referred to simply as convection, is the transfer of heat from one place to another by the movement of fluids. Convection is usually the dominant form of heat transfer in liquids and gases. Although often discussed as a distinct method of heat transfer, convective heat transfer involves the combined processes of unknown conduction and advection.
By contrast, convection is the transfer of heat by bulk movement or circulation within a fluid (a liquid like water or a gas like the air). In Figure 11, heat is transmitted from the electric element, through the pan to the water in contact with the base of the pan by conduction.