human
Can you explain how a car engine works?
assistant
A car engine is a complex machine that converts energy from gasoline into motion. It does this by taking in the fuel, burning it and then converting the resulting gas into mechanical power. The first step is to compress the air/fuel mixture in the cylinder. This causes the temperature of the air/fuel mixture to rise rapidly, which creates more pressure inside the cylinder. Next, the spark plug ignites the compressed air/fuel mixture. As the flame burns, the pressure within the cylinder increases dramatically, pushing the piston downwards. Finally, the exhaust valve opens and allows the burnt gases to escape, allowing the piston to move back up again. This process repeats itself thousands of times per minute, creating the engine's power output.