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QUDT VOCAB Quantity Kinds Release 2.1.25
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quantitykind:Emissivity
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http://qudt.org/vocab/quantitykind/Emissivity
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Emissivity
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Emissivity of a material (usually written \(\varepsilon\) or e) is the relative ability of its surface to emit energy by radiation.
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http://en.wikipedia.org/wiki/Emissivity
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\(\varepsilon = \frac{M}{M_b}\), where \(M\) is the radiant exitance of a thermal radiator and \(M_b\) is the radiant exitance of a blackbody at the same temperature.
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\(\varepsilon\)