Compressed air
Compressed air, that is, air compressed by external force. The air is compressible, and the air that is compressed by the air compressor to reduce its volume and increase the pressure is called compressed air. Compressed air is an important source of power. Compared with other energy sources, it has the following obvious characteristics: clear and transparent, convenient to transport, no special harmful properties, no fire hazard, not afraid of overload, can work in many adverse environments, the air is everywhere on the ground, take it Not enough.