Pounds per square inch (for MSDS purposes) is the pressure a material exerts on the walls of a confining vessel or enclosure For technical accuracy, pressure must be expressed as psig (pounds per square inch gauge) or psia (pounds per square inch absolute; that is, gauge pressure plus sea level atmospheric pressure, or psig plus approximately 14 7 pounds per square inch) Also see mmHg
(Otomotiv) The amount of air pressure in tires and the amount of compression of the fuel/air mixture in the combustion chamber. In the metric system, pressure is measured by kilometers per square centimeter
Pounds Per Square Inch, the pre-metric measure of pressure, still in everyday use in industry The metric equivalent is Kilonewtons per square centimeter Also measured in Bars (or Barometer) is equal to 14 2 pounds per square inch