Why is force exerted on a small piston multiplied when it acts on a larger pistion?

Suppose the smaller piston was 1 square cm and the large piston was 7 square cm. If you pushed on the small piston, the force would be multiplied 7 times on the large piston.

The Hydraulic System is a system that uses liquids to transmit pressure and multiply force in a confined fluid.

Hope this helped. (: