What is a Internal Combustion Engine?

An Internal combustion engine is a heat engine where the combustion of a fuel occurs with an oxidizer(air). In this engine, both the reactant and product of the combustion used as working fluid of the engine. The heat released from the combustion of fluid supplies its energy to the engine. The energy produced from the hot gaseous product of combustion acts on a piston, nozzle, a turbine blade. The internal combustion engine is extensively used in vehicles, boats, trains, aeroplanes and it is the most common form of heat engine.