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The e-ILV provides free access to all the terms and definitions contained in the international standard CIE S 017:2020 ILV: International Lighting Vocabulary, 2nd edition.

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17-24-009

emissivity

hemispherical emissivity

ε ; εh

quotient of the radiant exitance of a radiator, Me, and the radiant exitance of a Planckian radiator at the same temperature, Mb

Note 1 to entry: The emissivity has unit one.

Note 2 to entry: This entry was numbered 845-04-09 in IEC 60050-845:1987.

Note 3 to entry: This entry was numbered 17-382 in CIE S 017:2011.

Publication date: 2020-12
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