From Wikipedia, the free encyclopedia

Emission may refer to:

Chemical products[edit]

Electromagnetic radiation[edit]

  • Emission spectrum, 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, 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), the proposal that visual perception is accomplished by rays of light emitted by the eyes

Other uses[edit]

  • 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 ejection of semen from the penis; also, specifically:
  • Noise, emission
  • Exhalation of air, especially in the context of musical instruments

See also[edit]