PSI stands for which unit in pressure measurement?

• A. Pounds Per Square Inch
• B. Pounds Per Square Interval
• C. Pressure Per Square Inch
• D. Pounds per Square Index

Answer: (A)

Understanding common pressure units helps a lot here. PSI stands for pounds per square inch, meaning one pound-force applied evenly over one square inch of area. This is a standard unit of pressure used in the US, seen on tire gauges, air compressors, and hydraulic systems.

The other phrases aren’t used as the official unit. “Pounds Per Square Interval” isn’t a recognized measurement. “Pressure Per Square Inch” would awkwardly refer to pressure again in a way that doesn’t name the unit itself. “Pounds per Square Index” uses a non-existent term, so it isn’t correct.