- Radiation emitted by a body by virtue of its surface temperature, like sunlight from the Sun’s surface or heat from a flame. Its opposite is non-thermal radiation, which includes all emissions caused by non-temperature-related effects, and includes emissions like Cerenkov radiation.
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- noun heat transfer from one substance to another by means of electromagnetic waves
- The transmission of heat through electromagnetic waves from a warm surface to a cooler one.
- noun the rays of heat and light given off by a nuclear explosion