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There are several. psi; (pound-force per square inch) may be the most easily recognizable. 1 psi equals 6.894757kPa. Pascal(Pa) is the SI unit of pressure. It is the standard.

There is psig (pounds-force per square inch gauge). It is a unit of pressure that is relative to its surrounding atmosphere. At sea level, Earth's atmosphere exerts a pressure of 14.7 psi. We do not "feel" this pressure because the internal pressure of our bodily fluids is equal to the external pressure. If a pressure gauge is calibrated to read zero in space, then at sea level it would read 14.7psi. Here we go...A reading of 41 psig on a tire gauge represents an absolute pressure of 55.7 psi. Got it?

Psi and psig are very often used incorrectly. They are not interchangeable.

The ksi (kip, "kilo-pound[-force] per square inch") is equal to 1000 psi. This combines the kilo prefix with the psi abbreviation. It is often used in material sciences applications.

Here are some others.

torr(Torr) bar(bar) technical atmosphere(at) atmosphere(atm)

For more information go to: http://www.turnfast.com/refc_glossary/glossary/psig

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