Monopropellants are propellants consisting of chemicals that do not require an oxidizer to release their stored chemical energy. While stable under defined storage conditions, they decompose very rapidly under certain other conditions to produce a large volume of energetic (hot) gases for the performance of mechanical work. Although solid deflagrants such as nitrocellulose, the most commonly used propellant in firearms, and ammonium perchlorate/aluminum/synthetic rubber, widely used in military and spacecraft boosters, could be thought of as monopropellants, the term is usually reserved for liquids in engineering literature. Monopropellants release their energy through exothermic chemical decomposition. The molecular bond energy of the monopellant is released usually through use of a catal
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