Jet
1. 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.
2. Jet – the flow of something in one direction, which has a clear line.
Jets can travel long distances without dissipating. 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. Some animals, notably cephalopods, move by jet propulsion, as do rocket engines and jet engines.
Liquid jets are used in many different areas. In everyday life, you can find them for instance coming from the water tap, the showerhead, and from spray cans. In agriculture, they play a role in irrigation and in the application of crop protection products. In the field of medicine, you can find liquid jets for example in injection procedures or inhalers. Industry uses liquid jets for waterjet cutting, for coating materials or in cooling towers. Atomized liquid jets are essential for the efficiency of internal combustion engines. But they also play a crucial role in research, for example in the study of proteins, phase transitions, extreme states of matter, laser plasmas, High harmonic generation, and also in particle physics experiments. Also some animals, notably cephalopods, move by jet propulsion. Gas jets are found in rocket engines and jet engines.
A set of particles produced from the vacuum state by the movement of quarks
and gluons with high momentum [Oxford Reference].
The energy associated with electron-positron annihilation produces quark-
antiquark pairs. The quark and antiquark move away from each other very rapidly if
the electron and positron have high energies. The potential energy between the quark
and antiquark grows as they separate, thus causing further quarks and antiquarks to
emerge from the vacuum. These are swept along with the original quark and
antiquark. The overall effect is that two jets of hadrons emerge, one in the direction
of the first quark and the other in the direction of the first antiquark. *Quantum
chromodynamics predicts that about 10% of the events have three jets, the third due
to gluons. This prediction was confirmed experimentally in the late 1970s.
Merriam-Webster's Collegiate® Dictionary, Eleventh Edition https://www.merriam-webster.com/dictionary
Techopedia https://www.techopedia.com/definition/
Khan Academy https://www.khanacademy.org/science/physics/
Hornby, A. (1987). Oxford Advanced Learner’s Dictionary of Current English. Oxford: Oxford University Press. Jet. Merriam-Webster Online Dictionary. Retrieved from: https://www.merriam-webster.com/dictionary/jet
Jet. Oxford Reference. Retrieved from: https://www.oxfordreference.com/display/10.1093/acref/9780199233991.001.0001/a cref-9780199233991-e-1594?rskey=nkLxUI&result=1781 Oxford Dictionary Of Physics 7th ed.(2015). Oxford: University Press.