PSI stands for pounds per square inch. It is used as a unit of pressure.

Definition

PSI can be defined as the amount of pressure or stress of a pound of force per square inch of area. The symbol of psi is lb/in² or lbf/in².

PSI is commonly used in many pressure measuring applications like tire pressure, soil bearing capacity, wastewater management, fuel distribution & storage. 

Following are the major conversion for the PSI unit. 

• 1 PSI= 6894.76 Pascals (SI unit conversion)
• 1 PSI= 0.0689476 Bar
• 1 PSI= 0.068046 atmospheres
• 1 PSI= 51.7149 Torr
• 1 PSI= 2.03602 inHg
• 1 PSI= 27.7076 inches of the water column

Reference:

• 1. Setra Systems, setra.com