Internal combustion engine

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An internal combustion engine is an engine in which combustion, or the burning of fuel, occurs on the inside. This differs from external combustion engines where the fire is outside the engine, such as a steam engine.

There are many kinds of internal combustion engine but the term often means the machine that Niklaus Otto invented. ^[source?] In this kind, fire makes pressure increase inside a cylinder. The pressure pushes a piston which is attached to a wheel by a crank. The rod pushes the wheel and makes it spin around. The spinning wheel is attached to other wheels. The engine is very strong and can make all the wheels move.