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How does Pascal's principle relate to hydraulic lifts? Hydraulic lifts use Pascal's principle to amplify force. Pascal's principle tells us that pressure is transmitted equally throughout a static fluid. A small force exerted on a small area over a large distance is translated into a large force exerted on a large area over a small distance in a device like a car lift.
Therefore, in this case the pressure will be the same throughout the fluid, and the same in any direction at a point (Pascal's Principle). Pressure is expressed in units of force per unit area such as dyne/cm2, N/cm2 (pascal), pounds/in2 (psi) or pounds/ft2 (psf). The axiom that if a certain volume of fluid were somehow made solid, the equilibrium of forces would not be disturbed, is useful in reasoning about forces in fluids.