Application of Pascal's Principle: Hydraulics Pascal's principle (also known as Pascal's law) states that when a change in pressure is applied to an enclosed fluid, it is transmitted undiminished to all portions of the fluid and to the walls of its container. F₂ Piston P1-P2 P₁ = P2. F₁ F2 A₁ A₂ = P₂ A 70kg student balances a 1200kg elephant on a hydraulic lift. What is the diameter of the piston the student is standing on? 70 kg Concept: Changes in pressure are transmitted to all parts of the fluid and onto the container. Oil Skill: Using the definition of pressure and Pascal's Principle to calculate. 1200 kg 2.0 m Use density of oil = 900 kg/m^3 Those pistons are circles!
Fluid Pressure
The term fluid pressure is coined as, the measurement of the force per unit area of a given surface of a closed container. It is a branch of physics that helps to study the properties of fluid under various conditions of force.
Gauge Pressure
Pressure is the physical force acting per unit area on a body; the applied force is perpendicular to the surface of the object per unit area. The air around us at sea level exerts a pressure (atmospheric pressure) of about 14.7 psi but this doesn’t seem to bother anyone as the bodily fluids are constantly pushing outwards with the same force but if one swims down into the ocean a few feet below the surface one can notice the difference, there is increased pressure on the eardrum, this is due to an increase in hydrostatic pressure.
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