Definitions and Laws of Radiation


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Definitions and Laws of Radiation
Definitions and Laws of Radiation
<emphasis role="bold">Radiation Source</emphasis> Radiation—caused only by the fact that a radiating body has a temperature higher than absolute zero—can be considered from many different viewpoints. According to its purpose, radiation can be considered to be electromagnetic waves or a collection of radiation energy quanta, i.e., photons, which are the matter particles. The photons constitute a so-called photon gas. Therefore, analogously to a substance gas, a photon gas can be the subject of statistical (microscopic) or phenomenologica…
Citation
Ryszard Petela: Engineering Thermodynamics of Thermal Radiation: for Solar Power Utilization. Definitions and Laws of Radiation, Chapter (McGraw-Hill Professional, 2010), AccessEngineering Export