Hydraulic pressure is the force imparted per unit area of a liquid on the surfaces with which it has contact. Liquids are incompressible by nature, and as such, when a load acts upon it, the force is immediately transmitted to the contact surface. Hydraulic pressure is used in brakes, power steerings, clutches, farm equipment, and most heavy machinery. As with any type of pressure, it is a means of converting and/or concentrating mechanical energy to a more useful form or direction to power something.