Explain how combustion occurs in a gas engine.
Combustion in a gas engine occurs as a result of mixing fuel (such as gasoline) and air in the engine's combustion chamber. The process of combustion begins when the fuel-air mixture is ignited by a spark plug. This ignition causes the fuel molecules to break apart and release energy in the form of heat.
As the fuel-air mixture burns, it creates a rapid increase in temperature and pressure within the combustion chamber. This pressure forces the piston downwards, which in turn drives the crankshaft and ultimately powers the vehicle.
The combustion process releases exhaust gases, such as carbon dioxide and water vapor, which are expelled from the engine through the exhaust system. This continuous cycle of intake, compression, ignition, and exhaust is what allows the gas engine to generate power and propel the vehicle forward.