Propellant
CHEMICAL SUBSTANCE USED FOR PROPULSION OR PRESSURIZATION
Propellent; Propellants; Solid-propellant; Solid propellant; Propelant; Propellant efficiency; Propellant charge; Gun propellant; Storable propellant; Storable-propellant; Chemical propellant
A propellant (or propellent) is a mass that is expelled or expanded in such a way as to create a thrust or other motive force in accordance with Newton's third law of motion, and "propel" a vehicle, projectile, or fluid payload. In vehicles, the engine that expels the propellant is called a reaction engine.