1. The affinity laws express the mathematical relationship between variables that affect centrifugal and axial flow pump performance, such as capacity, head, horsepower, speed, and impeller diameter. 2. The laws state that capacity, head, and horsepower are directly proportional to speed, while directly proportional to the cube of impeller diameter. 3. The example demonstrates using the affinity laws to determine the performance of a pump with a 13" impeller operating at 2000 RPM, given its performance data at 1750 RPM for various impeller diameters. The laws are applied to points on the 1750 RPM curve to generate a new 2000 RPM performance curve.