What is the function of a pneumatic system in terms of gas usage?

The function of a pneumatic system primarily revolves around the use of compressed air to perform work. In this context, the correct answer emphasizes the process of compressing air, which is essential for the operation of pneumatic tools and equipment.

Pneumatic systems utilize compressed air because it is readily available and can be efficiently stored in tanks under pressure. The compression of air allows it to be used as a powerful force for various applications, such as driving actuators, cylinders, and other machinery. By creating a difference in pressure, these systems can control and move mechanical components with precision and speed.

While other concepts like absorption, low-pressure storage, or the use of multiple gases may have relevance in specific contexts, they do not align as closely with the primary function of a pneumatic system as the act of compressing air does. The core principle is the ability to harness compressed air to convert energy into mechanical work, making the focus on air compression key to understanding how pneumatic systems operate.