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A jet is a stream of fluid that is projected into a surrounding medium, usually from some kind of a nozzle, aperture or orifice. Jets can travel long distances without dissipating. In the Earth's atmosphere there exist jet streams that travel thousands of kilometres.
Jet fluid has higher momentum compared to the surrounding fluid medium. In the case that the surrounding medium is assumed to be made up of the same fluid as the jet, and this fluid has a viscosity, the surrounding fluid is carried along with the jet in a process called entrainment.
- Jet stream, a high level wind in the Earth's atmosphere
- Jet engine, any machine propelled by a jet
- Jet nozzle, how a jet is formed
- Jet damping, a jet carries away angular momentum from a device emitting it
- Jet of blood
- Astrophysical jet
- Lava fountain
- "a usually forceful stream of fluid (as water or gas) discharged from a narrow opening or a nozzle." http://www.merriam-webster.com/dictionary/jet
- Pijush K. Kundu and Ira M. Cohen, "Fluid mechanics, Volume 10", Elsevier, Burlington, MA,USA (2008), ISBN 978-0-12-373735-9
- Falkovich, G. (2011). Fluid Mechanics, a short course for physicists. Cambridge University Press. ISBN 978-1-107-00575-4.
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