generally means sending something out, and may refer to:
- Flue Gas , exhaust gases from a fireplace, oven, furnace, boiler or steam generator
- Exhaust Gas , occurs as a result of the combustion of fuels
See also: Emission Standard , Emissions Trading , Greenhouse Gas , Flue Gas Emissions From Fossil Fuel Combustion , Automobile Emissions Control , List Of Countries By Carbon Dioxide Emissions , Pollution , Portable Emissions Measurement System (PEMS) , Emission Factor , AP 42 Compilation Of Air Pollutant Emission Factors , Atmospheric Pollution Dispersion Modeling
- Emission (electromagnetic Radiation) , the process by which the energy of a photon is released by another entity
- 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
- Emission Line , or "spectral line", a dark or bright line in an otherwise uniform and continuous spectrum
- 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
- Ejaculation , the ejecting of semen from the penis
- --- Nocturnal Emission , ejaculation experienced during sleep
- Emitter , a device used to emit any signal, beacon, light, odor, liquid, fragrance, or any other type of signal
- Emission Coefficient , a coefficient in the power output per unit time of an electromagnetic source
- Emission Nebula , a cloud of ionized gas emitting light of various colors
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