Internal-combustion engine | Definition & Facts | Britannica
https://www.britannica.com/technology/internal-combustion-engine
WebMar 22, 2024 · internal-combustion engine, any of a group of devices in which the reactants of combustion (oxidizer and fuel) and the products of combustion serve as the working fluids of the engine. Such an engine gains its energy from heat released during the combustion of the nonreacted working fluids, the oxidizer-fuel mixture.
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