What term describes a unit of pressure equal to force per square inch?

• A. Hydraulic line
• B. Coil inductor
• C. Psi
• D. Hydraulic cavitation

Answer: (C)

Pressure is defined as the force applied over an area. When that area is one square inch and the force is measured in pounds, the resulting unit is pounds per square inch, abbreviated psi. Psi is a common unit for measuring pressure in the US customary system and is used in hydraulics, pneumatics, tires, and many mechanical systems. In metric terms, the same pressure would be expressed in pascals (N/m^2), with 1 psi ≈ 6.895 kPa.

The other terms describe something different: a hydraulic line is a fluid conduit, a coil inductor is an electrical component, and hydraulic cavitation is a phenomenon where vapor bubbles form in a liquid under low pressure. None of those are units of pressure, so psi is the correct term.