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The Manned Maneuvering Unit, or MMU, is a jetpack used in space. It uses compressed nitrogen as a propellant. Nitrogen is an inert gas that in most cases does not react with other gases.  However, any compressed gas could theoretically be used to push a person in space. For more information about the Manned Maneuvering Unit check out the website https://airandspace.si.edu/collection-objects/manned-maneuvering-unit-mmu.