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    quantitykind:Emissivity
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    http://qudt.org/vocab/quantitykind/Emissivity

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    lang:en
    Emissivity
    lang:""
    Emissivity of a material (usually written \(\varepsilon\) or e) is the relative ability of its surface to emit energy by radiation.
    lang:""
    \(\varepsilon = \frac{M}{M_b}\), where \(M\) is the radiant exitance of a thermal radiator and \(M_b\) is the radiant exitance of a blackbody at the same temperature.
    lang:""
    \(\varepsilon\)