Rather, the intermediaries are photons that travel at the speed of light. No medium need exists between the two bodies for heat transfer to take place as is needed by conduction and convection. Thermal radiation is defined as electromagnetic radiation in the wavelength range of 0.1 to 100 microns (which encompasses the visible light regime) and arises as a result of a temperature difference between two bodies. Radiation heat transfer is concerned with the exchange of thermal radiation energy between two or more bodies. In Introduction to Energy Essentials, 2021 C.8 Radiation heat transfer introduction
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