Fluids are also used to reduced friction. This lesson will answer those questions. There is a mini-quiz at the end of the lesson. An example is a cylinder with a piston. The pressure for both is the same.
P is the same on both pistons.
This is a mechanical advantage, similar to that seen with levers. Used in brakes Hydraulic mechanisms are used in the brakes in your car. The force applied on the brake pedal is multiplied on the brake drums. Another use is to jack up a heavy item, like a truck. The scientist Bernoulli discovered that the air pressure in a tube goes down when the velocity of the air in the tube increases.