Pascal's Principle

Pascal’s Principle states that when pressure is applied to a confined liquid, it spreads equally in all directions. In a simple demonstration often shown by Blaise Pascal, three connected glasses are used. Two glasses already contain the same liquid while one is empty. When liquid is poured through a pipe into one glass, it flows through the connecting tubes and the level becomes the same in all three glasses. This shows that pressure and liquid distribute evenly in a connected system.

Pascal's Law states that when pressure is applied to a confined fluid, it is transmitted equally in all directions throughout the fluid.

Because of this principle, a small force applied a small piston can produce a larger force on a bigger piston.