Final answer:
A centrifugal pump uses an impeller to spin the liquid outward, pushing it outwards due to the centrifugal force created by the rotating impeller.
Step-by-step explanation:
The pump that uses an impeller to spin the liquid outward is known as a centrifugal pump. It is commonly used in various applications, such as water supply systems, cooling systems, and wastewater treatment plants. The impeller rotates at high speeds, creating centrifugal force that pushes the liquid outwards, resulting in the movement of the liquid.