Emissions
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Emissions".

Look up emission in Wiktionary, the free dictionary.

Emission may refer to:

• Flue gas, also:
  • Exhaust gas, flue gas occurring as a result of the combustion of a fuel
• Emission of air pollutants
• Emission (electromagnetic radiation), the process by which the energy of a photon is released by another entity
• Emission (radiocommunications), the 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 factor
• 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 spectroscopy, mass spectroscopy, photoemission spectroscopy, flame emission spectroscopy and other types of spectroscopy
• Emission standard
• 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
• Emissions trading
• Ejaculation, the ejecting of semen from the penis; also, specifically:
  • Nocturnal emission, ejaculation experienced during sleep
• Light emission
• 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
• Noise emission; see Noise

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