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Wikipedia: The internal combustion engine is an engine in which the combustion of a fuel occurs with an oxidizer (usually air) in a combustion chamber. In an internal combustion engine the expansion of the high temperature and pressure gases, which are produced by the combustion, directly applies force to a movable component of the engine, such as the pistons or turbine blades and by moving it over a distance, generate useful mechanical energy. The term internal combustion engine usually refers to an engine in which combustion is intermittent, such as the more familiar four-stroke and two-stroke piston engines, along with variants, such as the Wankel rotary engine.
![[One-cylinder gasoline engine (ca. 1910)]](http://images.ookaboo.com/photo/s/Moore_single_cylinder_gasoline_engine_s.jpg "One-cylinder gasoline engine (ca. 1910)")
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![[A 1906 gasoline engine]](http://images.ookaboo.com/photo/s/Antique_gasoline_engine_s.jpg "A 1906 gasoline engine")
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