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The document discusses internal combustion engines and how they convert chemical energy from fuel into mechanical energy. It provides examples of internal combustion engines like gasoline and diesel engines. It also discusses external combustion engines, where combustion of fuel occurs outside the engine cylinder. The key differences are that internal combustion engines have one working fluid and combustion occurs inside the cylinder, while external combustion engines have two working fluids and combustion occurs outside. Internal combustion engines are smaller and have less heat losses than external combustion engines.
