Emission may refer to:
Chemical products
* Emission of
air pollutants, notably:
**
Flue gas, gas exiting to the atmosphere via a flue
**
Exhaust gas, flue gas generated by fuel combustion
**
Emission of greenhouse gases
Emission may refer to:
Chemical products
* Emission of air pollutants, notably:
** Flue gas, gas exiting to the atmosphere via a flue
** Exhaust gas, flue gas generated by fuel combustion
** Emission of greenhouse gases, which absorb and emit ...
, which absorb and emit radiant energy within the thermal infrared range
*
Emission standards, limits on pollutants that can be released into the environment
*
Emissions trading, a market-based approach to pollution control
Electromagnetic radiation
*
Emission spectrum
The emission spectrum of a chemical element or chemical compound is the Spectrum (physical sciences), spectrum of frequencies of electromagnetic radiation emitted due to electrons making a atomic electron transition, transition from a high energ ...
, the spectrum of frequencies of electromagnetic radiation generated by molecular electrons making transitions to lower energy states
*
Thermal emission, electromagnetic radiation generated by the thermal motion of particles in matter
*
List of light sources
This is a list of sources of light, the visible part of the electromagnetic spectrum. Light sources produce photons from another energy source, such as heat, chemical reactions, or conversion of mass or a different frequency of electromagnetic ener ...
, including both natural and artificial processes that emit light
*
Emission (radiocommunications), a 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 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 theory (relativity), a competing theory for the special theory of relativity, explaining the results of the Michelson-Morley experiment
*
Emission theory (vision)
Emission theory or extramission theory (variants: extromission) or extromissionism is the proposal that visual perception is accomplished by eye beams emitted by the eyes. This theory has been replaced by '' intromission theory'' (or ''intromis ...
, the proposal that visual perception is accomplished by rays of light emitted by the eyes
Other uses
*
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
*
Ejaculation
Ejaculation is the discharge of semen (the ''ejaculate''; normally containing sperm) from the penis through the urethra. It is the final stage and natural objective of male sexual stimulation, and an essential component of natural conception. ...
, the ejection of semen from the penis; also, specifically:
**
Nocturnal emission
A wet dream, sex dream, or sleep orgasm, is a spontaneous occurrence of sexual arousal during sleep that includes ejaculation (nocturnal emission) and orgasm for a male, and vaginal lubrication and/or orgasm for a female.
Context
Nocturnal e ...
, ejaculation experienced during sleep
*
Noise
Noise is sound, chiefly unwanted, unintentional, or harmful sound considered unpleasant, loud, or disruptive to mental or hearing faculties. From a physics standpoint, there is no distinction between noise and desired sound, as both are vibrat ...
, emission
*
Exhalation of air, especially in the context of musical instruments
See also
*
Emissions control (disambiguation)
*
Emitter (disambiguation)
*
Emit (disambiguation)
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