# Tell us about the principle of operation of a hydraulic press. Explain why a hydraulic press gives you a power advantage.

Hydraulic presses are used where a lot of force is required, for example, for squeezing oil from seeds in oil mills, for pressing cardboard, plywood, hay. The main part of the hydraulic press is two cylinders of different diameters, equipped with pistons and connected by a tube. The space under the pistons and the tube are filled with liquid The heights of the liquid columns in both cylinders are the same as long as no forces act on the pistons. According to Pascal’s law, the pressure of a fluid at rest is transmitted in all directions without change. Pressure under the small piston P = F1 / S2 pressure under the large piston P = F2 / S2 hence F1 / S1 = F2 / S2 whence F2 / F1 = S2 / S1 i.e. the force F2 is as many times the force F1 as the area of the larger piston is larger than the area of the small one.