Editing Liquid rocket propellant (section)

==Monopropellants==
{{unreferenced section|date=March 2017}}
;[[High-test peroxide]]: High test peroxide is concentrated [[Hydrogen peroxide]], with around 2% to 30% water. It decomposes to steam and oxygen when passed over a catalyst. This was historically used for reaction control systems, due to being easily storable. It is often used to drive [[Turbopump]]s, being used on the [[V2-rocket|V2 rocket]], and modern [[Soyuz (rocket family)|Soyuz]].
;[[Hydrazine]]: decomposes energetically to nitrogen, hydrogen, and ammonia (2N<sub>2</sub>H<sub>4</sub> → N<sub>2</sub>+H<sub>2</sub>+2NH<sub>3</sub>) and is the most widely used in space vehicles. (Non-oxidized ammonia decomposition is endothermic and would decrease performance).
;[[Nitrous oxide]]: decomposes to nitrogen and oxygen.
;[[Steam]]: when externally heated gives a reasonably modest I<sub>sp</sub> of up to 190 seconds, depending on material corrosion and thermal limits.