emissivity

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Related to Graybody: Grey body

e·mis·siv·i·ty

(ē'mi-siv'i-tē),
The giving off of heat rays; a perfect "black body" has an emissivity of 1, a highly polished metallic surface may have an emissivity as low as 0.02.
Farlex Partner Medical Dictionary © Farlex 2012

emissivity

(ĕm″ĭ-sĭv′ĭ-tē)
The ability of a substance or surface to emit radiant energy.
Medical Dictionary, © 2009 Farlex and Partners
References in periodicals archive ?
His vigor and intellect not only belie all of the President's arguments, they make him one who finds, as Cicero did, that "old age sits lightly upon me" (138).(1) Not surprisingly, he becomes increasingly reluctant to serve as the country's first "departee." Neverbend's allies are either young and thoughtless, like most of his legislature, young and avaricious like Grundle, who wants Crasweller dead so he can marry his daughter and fortune, or old and essentially dead like Graybody, the curator of the College of Deposition.
This approach for obtaining a temperature is straightforward, if the measured surface behaves as a perfect emitter, or if the spectral emissivity is known in the case of graybody radiation.
The goal was to protect as wide a bandpass as possible, so flares were composed of materials which would emit over a wide spectrum (graybody radiators).