EMISSION

'Emission' generally means sending something out, and may refer to:

★ Flue gas, exhaust gases from a fireplace, oven, furnace, boiler or steam generator

★ Exhaust gas, occurs as a result of the combustion of fuels
See also: Emission standard, Emissions trading, Greenhouse gas, Flue gas emissions from fossil fuel combustion, Automobile emissions control, List of countries by carbon dioxide emissions, Pollution, Portable Emissions Measurement System (PEMS), Emission factor, AP 42 Compilation of Air Pollutant Emission Factors, Atmospheric pollution dispersion modeling

★ Emission (electromagnetic radiation), the process by which the energy of a photon is released by another entity

★ 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

★ Emission line, or "spectral line", a dark or bright line in an otherwise uniform and continuous spectrum

★ 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

★ Ejaculation, the ejecting of semen from the penis

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★ Nocturnal emission, ejaculation experienced during sleep

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See also

See also

★ Emitter, a device used to emit any signal, beacon, light, odor, liquid, fragrance, or any other type of signal

★ Emission coefficient, a coefficient in the power output per unit time of an electromagnetic source

★ Emission nebula, a cloud of ionized gas emitting light of various colors