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 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 controlElectromagnetic radiation
* 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 eyesOther 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 ejection of semen from the penis; also, specifically: ** Nocturnal emission, ejaculation experienced during sleep * Noise, emission * Exhalation of air, especially in the context of musical instrumentsSee also
* Emissions control (disambiguation) * Emitter (disambiguation) * Emit (disambiguation) {{disambiguation