In hydraulics, what does the unit PSI stand for?

In hydraulics, what does the unit PSI stand for?

• A. Pounds per second inch
• B. Pounds per square inch
• C. Pressure per square inch
• D. Power per square inch

Answer: (B)

PSI is a unit of pressure, defined as pounds of force per square inch of area. In hydraulics, pressure measures how much push the fluid exerts on an area, and it’s what drives motion and force transfer through the system. The key relationship is F = P × A: the force a hydraulic component can achieve equals the pressure times its area. So, knowing the pressure in psi and the piston area lets you calculate the output force in pounds. For example, a piston with 2 square inches of area under 60 psi can exert 120 pounds of force. The other phrasings don’t fit because they either mix in a rate or a different quantity (power) rather than pressure.

PSI is a unit of pressure, defined as pounds of force per square inch of area. In hydraulics, pressure measures how much push the fluid exerts on an area, and it’s what drives motion and force transfer through the system. The key relationship is F = P × A: the force a hydraulic component can achieve equals the pressure times its area. So, knowing the pressure in psi and the piston area lets you calculate the output force in pounds. For example, a piston with 2 square inches of area under 60 psi can exert 120 pounds of force. The other phrasings don’t fit because they either mix in a rate or a different quantity (power) rather than pressure.