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reactive thrust

reactive thrust in Science
reactive thrust
Thrust generated by an engine through the rapid expulsion of propellant or its exhaust in a particular direction. By Newton's third law, the force required to expel the propellant or exhaust is counterbalanced by an equal and opposite force, driving the engine (and its vehicle) in the opposite direction. See also ion engine, Newton's laws of motion.

The American Heritage® Science Dictionary
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