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Rocket propellant is a material used by a rocket as, or to produce in a chemical reaction, the reaction mass (propulsive mass) that is ejected, typically with very high speed, from a rocket engine to produce thrust, and thus provide spacecraft propulsion. In a chemical rocket propellants undergo exothermic chemical reactions to produce hot gas. There may be a single propellant, or multiple propellants; in the latter case one can distinguish fuel and oxidizer. The gases produced expand and push on a nozzle, which accelerates them until they rush out of the back of the rocket at extremely high speed.
For smaller attitude control thrusters, a compressed gas escapes the spacecraft through a propelling nozzle.
A potential other method is that the propellant is not burned but just heated.
In ion propulsion, the propellant is made of electrically charged atoms (ions), which are electromagnetically pushed out of the back of the spacecraft. Magnetically accelerated ion drives are not usually considered to be rockets however, but a similar class of thrusters use electrical heating and magnetic nozzles.
In pulse propulsion, a heavy, metallic base acquires the force from an explosion behind it, for example from an atomic bomb, and a transfers it to a dampening system that reduces the shock to the payload.