- Emission
Emission may refer to:
*Flue gas , also:
**Exhaust gas , flue gas occurring as a result of the combustion of a fuel
* Emission ofair pollutant s
*Emission (electromagnetic radiation) , the process by which the energy of a photon is released by another entity
*Emission (radiocommunications) , the radio signal (usually modulated) emitted from a radio transmitter
*Emission coefficient , a coefficient in the power output per unit time of an electromagnetic source
*Emission factor
*Emission line , or "spectral line", a dark or bright line in an otherwise uniform and continuous spectrum
*Emission nebula , a cloud of ionized gas emitting light of various colors
*Emission spectroscopy , mass spectroscopy, photoemission spectroscopy, flame emission spectroscopy and other types of spectroscopy
*Emission standard
*Emission theory , a competing theory for the special theory of relativity, explaining the results of the Michelson-Morley experiment
*Emission theory (vision) , the proposal that visual perception is accomplished by rays of light emitted by the eyes
*Emissions trading
*Ejaculation , the ejecting of semen from the penis; also, specifically:
**Nocturnal emission , ejaculation experienced during sleep
*Light emission
*Thermionic emission , the flow of charged particles called thermions from a charged metal or a charged metal oxide surface, archaically known as the Edison effect
* Noise emission; seeNoise
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