Thermal radiation is electromagnetic radiation emitted by matter because of its temperature. Matter in thermal equilibrium emits a spectrum governed by its absorptivity, approaching the Planck law for a blackbody.
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Thermal radiation is a type of electromagnetic radiation emitted by all objects based on their temperature. It is a process through which energy is transferred in the form of infrared radiation, primarily due to the thermal motion of charged particles within matter. Key points about thermal radiation include: 1. **Blackbody Radiation**: An idealized object that absorbs all incoming radiation (a perfect blackbody) emits thermal radiation that depends solely on its temperature.