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The jet or reaction engine is the engine in which the energy of fuel or some other energy is transformed into the kinetic energy is transformed into the kinetic energy of a gaseous jet (or a flow of some other propulsive mass) streaming out of the engine to me engine to the ambient medium. The reactive force (thrust) moving the flying or some other transportation machine on which the engine is installed.A few words about the origin of the reactive force. The effect, which is produced onthe propulsive mass during the jet engine operation, causes this propulsive mass to accelerate in the direction opposite to the movement of the transportation vehicle.