PSI - Pound per Square Inch
Pound per Square Inch is a unit of pressure resulting from a force of one pound-force applied to an area of one square inch.
1 psi = 1 lb. (pound) / (1 inch)2
1 psi - 6894.75729 pascals (SI unit of pressure)
PSI - Population Service International
Population Services International is a global health organization Headquartered in Washington, D.C., (US) and Amsterdam. The organization provides clinical services and life-saving drugs for major diseases like HIV, Malaria and child Survival.