Emission may refer to:
Chemical products
* Emission of
air pollutants, notably:
**
Flue gas, gas exiting to the atmosphere via a flue
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Exhaust gas, flue gas generated by fuel combustion
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Emission of greenhouse gases
Greenhouse gas emissions from human activities strengthen the greenhouse effect, contributing to climate change. Most is carbon dioxide from burning fossil fuels: coal, petroleum, oil, and natural gas. The top contributors to greenhouse gas emi ...
, which absorb and emit radiant energy within the thermal infrared range
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Emission standards, limits on pollutants that can be released into the environment
*
Emissions trading, a market-based approach to pollution control
Electromagnetic radiation
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Emission spectrum
The emission spectrum of a chemical element or chemical compound is the spectrum of frequencies of electromagnetic radiation emitted due to an electron making a atomic electron transition, transition from a high energy state to a lower energy st ...
, the spectrum of frequencies of electromagnetic radiation generated by molecular electrons making transitions to lower energy states
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Thermal emission, electromagnetic radiation generated by the thermal motion of particles in matter
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List of light sources, including both natural and artificial processes that emit light
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Emission (radiocommunications), a radio signal (usually modulated) emitted from a radio transmitter
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Emission coefficient, a coefficient in the power output per unit time of an electromagnetic source
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Emission line, or "spectral line", a dark or bright line in an otherwise uniform and continuous spectrum
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Emission nebula, a cloud of ionized gas emitting light of various colors
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Emission theory (relativity), a competing theory for the special theory of relativity, explaining the results of the Michelson-Morley experiment
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Emission theory (vision), the proposal that visual perception is accomplished by rays of light emitted by the eyes
Other uses
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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
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Ejaculation, the ejection of semen from the penis; also, specifically:
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Nocturnal emission, ejaculation experienced during sleep
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Noise, emission
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Exhalation of air, especially in the context of musical instruments
See also
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Emissions control (disambiguation)
*
Emitter (disambiguation)
Emitter may refer to:
__NOTOC__ Devices which emit charged particles
*Cathode, or negative electrode, in a vacuum tube or diode
*Anode, or positive electrode, in certain applications based on the emission of ions from a solid surface
*One of the t ...
*
Emit (disambiguation)
Enzyme multiplied immunoassay technique (EMIT) is a common method for qualitative and quantitative determination of therapeutic and recreational drugs and certain proteins in serum and urine.
It is an immunoassay in which a drug or metabolite in ...
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