PSI full form is Pounds per Square Inch, a pressure unit used in tires, hydraulics, and industries for safety and efficiency. What is the full form of PSI? - Pounds per square inch - The pound per square inch or, more accurately, pound-force per square inch (symbol: psi or lbf/in2 o PSI stands for Pounds per Square Inch, a unit of pressure. Learn how to convert PSI to other units, such as pascals, atmospheres, and torr. PSI is a unit of pressure used mainly in the United States and other countries using the imperial measurement system. PSI measures the amount of force (in pounds) exerted per square inch of surface area.
