Propellant facts for kids
Propellant is something that expands as a gas to propel something else. Aerosol spray cans, for example, have a liquid propellant that boils into a gas to push another liquid out of the can. Guns and rockets have propellants in them that burn, creating hot gases.
See also
In Spanish: Propelente para niños
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Propellant Facts for Kids. Kiddle Encyclopedia.