In the system illustrated, which of the following readings should be indicated on the pressure gage, if the load (x) is 8000 lbs. (3632 kg) and the piston area (y) is 10 sq. in (64.5 sq. cm)? Illustration GS- 0062
• Pascal’s Law in a hydraulic system (pressure is transmitted equally throughout the fluid) • Relationship Pressure = Force ÷ Area (make sure units match: pounds and square inches) • How the piston area (y) and load (x) determine the pressure seen at the gage (z)
• If the piston must support an 8,000 lb load, what force must the hydraulic fluid apply to the underside of the piston? • Given that force and a piston area of 10 sq. in., what pressure in pounds per square inch (psi) is required? • Once you find the pressure in psi, which answer choice is closest to that value and to the kg/cm² value shown with it?
• Confirm you are using Pressure = Load (lb) ÷ Area (sq. in.) and not multiplying instead of dividing • Double-check that the pressure at the piston is the same as the pressure at the gage in an ideal hydraulic system • Verify your arithmetic carefully: 8,000 divided by 10, and then compare that psi value to the listed choices
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