what is emissivity?
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Emissivity is defined as the ratio of the energy radiated from a material's surface to that radiated from a a perfect emitter, known as a blackbody, at the same temperature and wavelength and under the same viewing conditions.
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Amazon it is defined as the ratio of the energy radiated from materials surface to that radiated from a perfect emitter known as black body at the same temperature and wavelength and under the same viewing conditions .
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