What does pneumatic mean?

Pneumatic refers specifically to systems or mechanisms that utilize gas or air under pressure to function. This term is often applied in engineering and mechanical contexts to describe tools, equipment, or processes that rely on compressed air for operation. For instance, pneumatic systems are commonly used in a variety of applications, including construction tools like nail guns, as well as in industrial machinery for moving or controlling parts.

In contrast, the other terms do not align with the definition of pneumatic. The option that suggests containing only liquids pertains to hydraulic systems, which utilize liquid rather than gas or air. The option referring to a solid state is unrelated to the concept of pneumatic as it implies a completely different physical state. Lastly, relating to electrical systems does not capture the essence of pneumatics, which is grounded in the movement and control of gases or air, not electricity. Understanding this distinction is key in fields that integrate mechanical technologies, particularly in ensuring the correct application of different systems according to their properties and functionalities.