Lbs . For each Sq. Inch (psi) is actually a unit of evaluate that is definitely expressed in lbs . of force per square inch of location, and that is equal to 6894 Pa or 0.07 atm or 51.one hundred seventy five torr. PSI is based about the avoirdupois process of measurement, which works by using pounds and ounces as units of evaluate. Millimeters of