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Britannica Sources used in this answer

Why is nitrogen used to pressurize aerosol cans and rocket propellants?

Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.
A labeled diagram of a periodic table entry for nitrogen shows its atomic number 7, symbol N, electron configuration, atomic weight, and name. Symbols indicate nitrogen is a nonmetal gas at room temperature, has a hexagonal crystal structure, and strongly acidic higher-valence oxides. A key explains the diagram's icons and color coding.
nitrogen

Nitrogen is used to pressurize aerosol cans and liquid propellants for reaction jets primarily because it is a nonreactive, or inert, gas.1

By serving as an inert propellant, nitrogen provides the necessary pressure to expel the contents of an aerosol can without chemically reacting with the product inside. Similarly, in the context of rocket technology, nitrogen is used to pressurize liquid propellants, ensuring they can be effectively delivered to the engine without the risk of unwanted chemical interactions that could compromise the stability or performance of the propulsion system.1