Pounds per
Square
Inch 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
torr which is a measurement of milimeters of
Mercury, and
pascals which is the
SI unit.
See also Psi, parapsychology
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