User:Narendrapache/sandbox

DEFINATION - Jet propulsion is thrust produced by passing a jet of matter (typically air or water) in the opposite direction to the direction of motion. By conservation of momentum, the moving body is propelled in the opposite direction to the jet. A number of animals, including cephalopods, sea hares, arthropods, and fish have convergently evolved jet propulsion mechanisms. This is most commonly used in the jet engine, but is also the means of propulsion utilized by NASA to power various space craft.