Emissivity (E) : The Emissivity, of a surface is defined as the ratio of the emissive power of the surface to the emissive power of a hypothetical black body at the same temperature.
The Emissivity of a substance may depend both on temperature and wavelength. Sometimes Emissivity refer to radiation in all directions and sometimes in a given direction only.
The Emissivity of a substance may depend both on temperature and wavelength. Sometimes Emissivity refer to radiation in all directions and sometimes in a given direction only.
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