em·is·siv·i·ty ( m  -sv -t )n. The ratio of the radiation emitted by a surface to the radiation emitted by a blackbody at the same temperature. |
emissivity [ɪmɪˈsɪvɪtɪ ˌɛm-]
n
(Physics / General Physics) a measure of the ability of a surface to radiate energy; the ratio of the radiant flux emitted per unit area to that emitted by a black body at the same temperature. Symbol ε
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