Babylon 10
The world's best online dictionary

# Definition of Emissivity

## Babylon English

ability to emit (Physics)
Emissivity Definition from Language, Idioms & Slang Dictionaries & Glossaries
Webster's Revised Unabridged Dictionary (1913)
(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
hEnglish - advanced version

emissivity
\emis*siv"i*ty\ (?), n. tendency to emission; comparative facility of emission, or rate at which emission takes place; specif. (physics), the rate of emission of heat from a bounding surface per degree of temperature difference between the surface and surrounding substances (called by fourier external conductivity).
emissivity
\emis*siv"i*ty\ (?), 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.

Emissivity Definition from Science & Technology Dictionaries & Glossaries
Telecommunication Standard Terms
The ratio of power radiated by a substance to the power radiated by a blackbody at the same temperature. (188 )
Electronics Terminology
The ratio of the radiant energy emitted by a source to the radiant energy of a perfect radiating surface (black box) having an equivalent surface area with all other relevant conditions being the same.
WEATHER&METEOROLOGY
How well a system radiates at a given wavelength.
Technical English by wpv
The ratio of energy emitted by an object to the energy emitted by a blackbody at the same temperature. The emissivity of an object depends upon its material and surface texture; a polished metal surface can have an emissivity around 0.2 and a piece of wood can have an emissivity around 0.95.
Emissivity Definition from Encyclopedia Dictionaries & Glossaries
Wikipedia English - The Free Encyclopedia
The emissivity of a material (usually written e or e) is the relative ability of its surface to emit energy by radiation. It is the ratio of energy radiated by a particular material to energy radiated by a black body at the same temperature. A true black body would have an e = 1 while any real object would have e < 1. Emissivity is a dimensionless quantity.

 See more at Wikipedia.org...