Reaction engine

A reaction engine is an engine or motor that produces thrust by expelling reaction mass (reaction propulsion), in accordance with Newton's third law of motion. This law of motion is commonly paraphrased as: "For every action force there is an equal, but opposite, reaction force."

This article is about a propulsion engine. For the British aerospace company, see Reaction Engines Limited.
"Reaction motor" redirects here. For the American aerospace company, see Reaction Motors.

Examples include jet engines, rocket engines, pump-jets, and more uncommon variations such as Hall effect thrusters, ion drives, mass drivers, and nuclear pulse propulsion.

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