Propellant

Propellant is a substance that is used to power the engines of an aircraft. It is a fuel that is combined with an oxidizer to create a chemical reaction that produces thrust. The type of propellant used depends on the type of engine and the altitude at which the aircraft will be flying. Liquid propellants are commonly used in rocket engines, while solid propellants are used in missiles and some aircraft engines. The efficiency of a propellant is measured by its specific impulse, which is the amount of thrust produced per unit of propellant consumed.
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