Which of the following will not be affected when using the impeller size to adjust pump capacity?

The liquid volume within a system will not be directly affected by changes in the impeller size when adjusting pump capacity. While the size of the impeller does influence the hydraulic energy, pressure, and overall operation of the pump, it does not change the intrinsic volume of liquid being pumped. The liquid volume in a system is a fixed quantity based on the amount of liquid present in the source or reservoir, and adjusting impeller size will alter the rate at which that volume is moved or pressurized, but not the volume itself.

The relationship between impeller size and pump function primarily revolves around how quickly and efficiently the pump can move the liquid through the system, affecting aspects such as hydraulic energy and pressure. Changes in impeller size can lead to variations in flow rates, which may indirectly influence how long it takes for a given volume to be pumped; however, the total volume of liquid available does not change. Thus, understanding the role of impeller size is critical, but the actual volume remains a constant factor in this context.