Book 25, Question 75
How do pumps push water uphill?
Many city pumps have a spinning part called an impeller with curved blades.
As it whirls, it flings water outward, which creates pressure that pushes water through the pipe. Pumps run on electric motors and are used in water systems, sewers, and buildings. A pump cannot pull water up more than about 34 feet by suction alone, so it is usually placed to push.