emissivity
n.
ability to emit (Physics)
Emissivity
The emissivity of a material (usually written ) is the ratio of energy
radiated by the material to energy radiated by a
black body at the same temperature. It is a measure of a material's ability to absorb and radiate energy. A true
black body would have an while any real object would have . Emissivity is a numerical value and does not have units. Scientifically, it is defined as the ratio of the radiation emitted by a surface to the radiation emitted by a black body at the same temperature.
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Emissivity
(n.)
Tendency to emission; comparative facility of emission, or rate at which emission takes place, as of heat from the surface of a heated body.
Webster's Revised Unabridged Dictionary (1913), edited by Noah Porter.
About
emissivity
The ratio of
power radiated by a substance to the power radiated by a
blackbody at the same temperature. (
188 )
emissivity
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