What type of fluid is typically used in pneumatic systems?

Pneumatic systems primarily utilize gas, typically compressed air, as the working fluid. This method takes advantage of the compressibility of gases, allowing for rapid changes in pressure and efficient transfer of energy. The use of gas in pneumatic systems provides several benefits, such as the ability to operate equipment in environments where flammable liquids like oil or hydraulic fluids might pose a risk. Additionally, compressed air systems are often cleaner than systems that rely on fluids susceptible to contamination or spillage.

The nature of gas enables pneumatic systems to be more lightweight and portable, making them ideal for applications such as powering tools, actuators, and conveyors. Furthermore, maintaining and supplying compressed air is generally straightforward and cost-effective. Overall, the reliance on gas in pneumatic systems is fundamental to their design and operation, setting them apart from hydraulic systems, which use liquids.