Equation 15.3 shows that an increas

Equation 15.3 shows that an increase in surface pressure p0 results in the same pressure increase throughout the fluid. More generally, a pressure increase anywhere is felt throughout the fluid-a fact known as Pascal’s law. Pascal applied this principle in his invention of the hydraulic press. Today hydraulic systems, based on Pascal’s law, control machinery ranging from automobile brakes to aircraft wings, bulldozers, cranes, and robots.