A piston or a rotary heat engine directly powered by the products of intermittent combustion of a fuel
A heat engine in which intermittent or the continuous burning of a fuel takes place inside a combustion chamber; the resulting pressurized gas acts directly on the engine to do useful work, such as a piston engine, gas turbine, jet engine or rocket
An internal combustion engine is an engine that creates its energy by burning fuel inside itself. Most cars have internal combustion engines. an engine that produces power by burning petrol, used in most cars