Emission
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Emission may refer to:
Emission of 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 radiation in the thermal infrared range
- Emission intensity, a measure of the emission rate of a given pollutant from a given source
- Emission standards, requirements that set specific limits on the amount of certain pollutants that can be released into the environment
- Emissions trading, a market-based approach used to pollution control
Emission of electromagnetic radiation:
- Emission (electromagnetic radiation), a process by which energy is released in the form of photons
- 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 spectrum, photoemission spectroscopy, flame emission spectroscopy and other types of spectroscopy
- 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
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, the ejecting of semen from the penis; also, specifically:
- Nocturnal emission, ejaculation experienced during sleep
- Noise emission
- Exhalation of air, especially in the context of musical instruments
See also
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