Internal combustion engine

An internal combustion engine is a heat engine in which the combustion of a fuel occurs with an oxidizer in a combustion chamber that is an integral part of the working fluid flow circuit. In an internal combustion engine, the expansion of the high-temperature and high-pressure gases produced by combustion applies direct force to components of the engine. The force is typically applied to pistons, turbine blades, a rotor, or a nozzle.

This force moves the component over a distance.
This process transforms chemical energy into kinetic energy which is used to propel, move or power whatever the engine is attached to.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 3.0

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