History of PSI

	Revision 8 . . December 3, 2001 10:08 am by (logged).109.250.xxx [note 'pounds' means 'pounds-force'; give conversion from psi to kPa]
	Revision 7 . . December 3, 2001 2:47 am by The Anome [linked to parapsychology]
	Revision 6 . . (edit) December 3, 2001 2:03 am by (logged).191.188.xxx
	Revision 5 . . (edit) December 3, 2001 2:02 am by (logged).191.188.xxx
	Revision 4 . . (edit) July 31, 2001 7:03 am by Mike Dill

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Difference (from prior major revision) (no other diffs)

Changed: 1c1,3

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.

Pounds-force 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-force per square inch gauge) or psia (pounds-force 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. 1 psi approximately equals 6.895 kPa