Compressors are pneumatic devices that convert power (using electric motors, diesel or gasoline engines, etc.) into potential energy stored in compressed air (i.e., compressed air). The air compressor works by forcing more air into a tank, causing the pressure to increase. Once the pressure in the tank reaches its engineered upper limit, the air compressor shuts off. The compressed air is then held in the tank until called into use. As the compressed air is released and the tank depressurizes, the kinetic energy produced by the compressed air can be used for a variety of pneumatic tools.