EMISSIVITY

Etymology

Noun

emissivity (plural emissivities)

(physics) The energy-emitting propensity of a surface, usually measured at a specific wavelength.

Source: Wiktionary

Em`is*siv"i*ty, n.

Definition: Tendency to emission; comparative facility of emission, or rate at which emission takes place, as of heat from the surface of a heated body.

Source: Webster’s Unabridged Dictionary 1913 Edition

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