#external-combustion_engine  a heat engine in which ignition occurs outside the chamber (cylinder or turbine) in which heat is converted to mechanical energy
  supertype:  heat_engine  any engine that makes use of heat to do work
  subtype:  steam_engine__steamengine  external-combustion engine in which heat is used to raise steam which either turns a turbine or forces a piston to move up and down in a cylinder

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