What is Propellant?
'''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. [[Gun]]<nowiki/>s and [[rocket]]<nowiki/>s have propellants in them that burn, creating hot gases. [[Category:Gases]] [[Category:Propulsion]]