File:Delta_IV_launch_2013-08-28.jpg · Wikimedia Commons · See Wikimedia Commons
rocket propellant
Also known as rocket fuel
chemical or mixture used as fuel for a rocket engine
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A Delta IV Heavy during liftoff. The rocket is launched using liquid hydrogen and liquid oxygen cryogenic propellants. Rocket propellant is used as a reaction mass ejected from a rocket engine to produce thrust. The energy required can either come from the propellants themselves, as with a chemical rocket, or from an external source, as with ion engines.
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