In a hydraulic press, the small piston has area 0.01 m² and the large piston 0.1 m². A force of 100 N on the small piston produces on the large piston a force of:

Since the same volume of fluid must pass every cross-section per second (continuity), the fluid speeds up where the pipe narrows; Bernoulli's equation then says this faster-moving fluid has lower pressure - the principle behind a venturi meter and an aircraft wing's lift.