Rocket propellant
Rocket propellant is the reaction mass of a rocket. This reaction mass is ejected at the highest achievable velocity 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.
"Rocket fuel" redirects here. For the advertising company "FUEL", see Rocket Fuel Inc. For the drug regimen, see Mirtazapine § Interactions. For the song by Kasabian, see The Alchemist's Euphoria.