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
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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 frequencies of electromagnetic radiation generated by molecular electrons making transitions to lower energy states
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Thermal emission
Thermal radiation is electromagnetic radiation generated by the thermal motion of particles in matter. Thermal radiation is generated when heat from the movement of charges in the material (electrons and protons in common forms of matter) is ...
, 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)
Emission is the radiation or radio signal produced or emitted by a radio transmitting station.ITU Radio Regulations
Radio regulation refers to the regulation and licensing of radio in international law, by individual governments, and by municip ...
, 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, 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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