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http://qudt.org/vocab/quantitykind/EmissivityNamespace
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Emissivity
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Applicable units are those of quantitykind: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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$\varepsilon$