Combustion chamber
A combustion chamber is part of an Engine in which Fuel is burned. The leftover hot gases produced by this Combustion tend to 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. The energy can be converted to various types of motion or to produce Thrust when directed out of a Nozzle as in a Rocket or Jet engine.