Thermal Radiation
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2-1-510
Process of emission in which the radiant energy originates in the thermal agitation of the particles of matter (atoms, molecules, ions).
Note: The terms "thermal radiation" and, in German Temperaturstrahlung apply not only to the process of emission, but also to the radiation itself.
Reference: C.I.E.
Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)