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PETROL ENGINE
Petrol engine is an engine that uses petrol as a fuel. Inside the engine, the combustion (burning) of fuel mixed with air produces hot gases that expand against parts of the engine and cause them to move. For this reason, petrol engines are called internal-combustion engines. The motion inside the engine is transferred outside it to turn wheels and propellers or to operate machines. In this way, a petrol engine turns heat energy into mechanical work. The rate at which a petrol engine produces work is usually measured in horsepower or watts .
Petrol engines are compact and light in weight for the power they produce. This makes them one of the most important types of engines for vehicles. Nearly all cars, lawn mowers, motorcycles, motor scooters, snowmobiles, and small tractors have petrol engines. So do many trucks, buses, aeroplanes, and small boats. Petrol engines may also be used as portable power plants--for example, to supply the power to run pumps and other machinery on farms. Petrol engine is an engine that uses petrol as a fuel. Inside the engine, the combustion (burning) of fuel mixed with air produces hot gases that expand against parts of the engine and cause them to move. For this reason, petrol engines are called internal-combustion engines. The motion inside the engine is transferred outside it to turn wheels and propellers or to operate machines. In this way, a petrol engine turns heat energy into mechanical work. The rate at which a petrol engine produces work is usually measured in horsepower or watts .
Petrol engines are compact and light in weight for the power they produce. This makes them one of the most important types of engines for vehicles. Nearly all cars, lawn mowers, motorcycles, motor scooters, snowmobiles, and small tractors have petrol engines. So do many trucks, buses, aeroplanes, and small boats. Petrol engines may also be used as portable power plants--for example, to supply the power to run pumps and other machinery on farms...
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