An internal combustion engine works on the principle of ideal gas law . The law states that any increase in the temperature of a gas would increase its pressure to result in expansion of the same gas. The gas-fuel or air/fuel mixture is introduced in a closed chamber known as cylinder where it is ignited by producing a spark in a 4-stroke engine. The mixture burns due to its flammable property and also due to the difference in the temperature. The piston that is making a linear motion inside the cylinder increases the temperature and pressure when it travels from bottom dead center (BDC) to top dead center (TDC). The mixture gets ignited when the cylinder is sparked and by the ideal gas law principle it expands to push the piston down. This stroke is also known as power stroke as power is produced in this stroke. The explosion is so gigantic that if the piston is not made of a high strength material then it would create a hole inside the piston head. This is what goes on inside a s