An Engine is a machine that can convert other forms of energy into mechanical energy, including internal combustion engines (reciprocating piston engines), external combustion engines (Stirling engines, steam engines, etc.), jet engines, electric motors, etc. The internal combustion engine, for example, usually converts chemical energy into mechanical energy. Engine applies to both the power generating plant and the whole machine including the power plant (e.g., gasoline engine, aeroengine). The engine was first invented in England, so the concept of an engine also comes from English, meaning "the mechanical device that generates power".
