The increasing pressure and heat inside the earth resulted in the formation of oil that is lying deep beneath the rocks and available abundantly mostly in Middle Eastern countries. It is the decay of old animals that lied under the earth for millions of years and finally paved its way for the formation of oil. Every time when you go to nearest station to fill your car’s tank, it’s the fossil fuel i.e. oil in its refined form, which is use to power your vehicle. The engine of your car burns the fuel and release energy in the form of heat. The heat energy then goes through various processes before finally converting to mechanical energy. The mechanical energy is the used to drive the vehicle.