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pressure the result of a force distributed over an area pascal SI unit for pressure. (newtons per square meter) fluid substance that assumes the shape of its container. can also flow. includes both liquids and gases. Pascal's Principle a change in pressure at any point in a fluid is transmitted equally and unchanged in all directions throughout the fluid hydraulic system device that uses pressurized liquid acting on pistons of different sizes to change a force. works because of Pascal's principle Bernoulli's Principle as the sped, of a fluid, increases, the pressure within the the fluid decreases. causes airplanes to lift into the air lift this upward force is created because of the pressure difference between the top and bottom of the wing of a plane buoyancy the ability of a fluid to exert and upward force on an object placed in it. results in the apparent loss of weight of an object in a fluid Archimedes' Principle the buoyant force of an object is equal to the weight of the fluid displaced by the object buoyant force acts opposite the direction of weight force on an object submerged in a fluid type of fluid and depth two factors that determine the amount of pressure a fluid exerts if an object is less dense than the fluid it's in it will float if an object is more dense than the fluid it's in it will sink when the buoyant force is equal to the weight an object floats or is suspended when the buoyant force is less than the weight the object sinks