Nonpropellants
Nonpropellants are substances or systems that do not generate thrust in propulsion contexts. They are used in a variety of fields to support operation, safety, or delivery without acting as the main propulsive force. In aerospace and rocketry, for example, nonpropellants include inert gases or liquids used for purging, pressurizing, cooling, or providing an inert atmosphere in tanks and lines. They may also serve as ballast or shielding media and can help prevent unwanted reactions or fires by displacing oxygen or flammable vapors.
Common nonpropellant gases used in propulsion-related applications are nitrogen, helium, and argon. Nitrogen is often employed
Beyond aerospace, nonpropellant delivery systems appear in consumer and industrial contexts. Some devices expel contents without