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The preburner cycle is a thermodynamic cycle used in some liquid-propellant rockets. Liquid-propellant rockets are rocket engines that use liquids to create thrust. In the preburner cycle, one propellant is partly burned in a preburner chamber with a small portion of another propellant. This combustion produces a hot gas that powers the engine’s turbines and pumps. Next, this gas is pushed into the main combustion chamber. In this chamber, the gas is burned with the rest of the second propellant to complete the combustion reaction.