Final answer:
An air cooling system circulates air over cylinders to prevent overheating, using the process of convection.
Step-by-step explanation:
An air cooling system circulates air over cylinders to prevent overheating. This process is known as convection, which is driven by the large-scale flow of matter. In the case of air cooling systems, cooler air is circulated over the warm cylinders, allowing heat transfer through convection. This helps in dissipating the excess heat and prevents the cylinders from overheating.