Pneumatic pipeline, also called pneumotransport or pneumatic conveying, is the use of air or another gas to transport powdered or granular solids through pipes. A vacuum (suction) is created in the pipe by the prime mover to suck or move the solid-air mixture through the pipe. The negative-pressure systems, also called suction systems, behave like a vacuum cleaner. The prime mover (an air pump) of the system is placed near the exit of the pipe. The device efficiently separates the solids from the air by utilizing the centrifugal force generated from the spiral motion of the solids entering the separator in a tangential direction. The mixture enters the separator at a level below the baffle, which prevents the particles from rising and entering the filter zone. The positive-pressure system uses an air pump (blower) located near the inlet of a pipe. It can develop a pressure differential across the pipeline much greater than one atmosphere.