What describes a system operated by air or gas under pressure?

A system operated by air or gas under pressure is characterized by the use of compressed air or gas to power tools, machinery, or processes. Pneumatic systems utilize this principle, where air is pressurized and then directed through hoses and pipes to produce movement or perform work. This technology is widely employed in various applications, including manufacturing, construction, and automotive industries, where it offers advantages such as lighter weight compared to hydraulic systems and the capability for rapid actuation.

In contrast, hydraulic systems operate using liquids under pressure, relying on incompressible fluids for the transmission of power. Mechanical systems are based on moving parts and do not necessarily involve the use of fluids or gases. Vacuum systems operate by creating a low-pressure environment rather than using pressurized air or gas. Thus, the distinguishing feature of a pneumatic system is its reliance on the pressurization of air or gas to function.