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Read the text: Combustion chambers.
A combustion chamber is the part of an engine in which fuel is burned. The hot gases produced by the combustion occupy a far greater volume than the original fuel, thus creating an increase in pressure within the limited volume of the chamber. This pressure can be used to do work, for example, to move a piston on a crankshaft or a turbine disc in a gas turbine. The energy can also be used to produce thrust when directed out of a nozzle as in a rocket engine.
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