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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.〔"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〕 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 where the surrounding medium is assumed to be made up of the same fluid as the jet, and this fluid has a viscosity, than the surrounding fluid near the jet is assumed to be carried along with the jet by a process called entrainment. Some animals, notably cephalopods, use a jet to propel themselves in water. Similarly, a jet engine as it name suggests, emits a jet used to propel rockets, aircraft, jetboats, and submarines. ==See also== * 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 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Jet (fluid)」の詳細全文を読む スポンサード リンク
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