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. PSI full form is Pounds per Square Inch, a pressure unit used in tires, hydraulics, and industries for safety and efficiency. 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. Guide to Full Form of PSI . Here we discuss the Definition and How to Calculate Pounds Per Square Inch along with Difference.
