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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.
Answer. The three methods of heat transfer can occur in different ratios depending on the materials and environment. Radiation, for example, is the only method by which internal energy can be transferred through a vacuum. So when a hot object is near a cold one in space, 100% of the heating is by radiation.