Pound-force per square inch
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- The abbreviation PSI has multiple meanings, see Psi for other possibilities.
Pounds-force per square inch (lbf/in²) is a non-SI unit of pressure. At 1 lbf/in², a force of one pound-force is applied to an area of one square inch. Both 'PSI' or 'psi' are used as the abbreviation.
One lbf/in² approximately equals 6.895 kPa. Atmospheric pressure is approximately 14.7 lbf/in².
Other abbreviations are used:
- psia (pounds-force per square inch absolute) gauge pressure plus local atmospheric pressure
- psid (psi difference) difference between two pressures
- psig (pounds-force per square inch gauge)
- psivg (psi vented gauge) difference between the measuring point and the local pressure
- psisg (psi sealed gauge) difference between a chamber of air sealed at atmospheric pressure and the pressure at the measuring point
- ksi (kludge) = 1000 psi, combining the prefix kilo with psi abbreviation. It is occasionally seen in materials science and mechanical engineering. It is commonly used to specify stresses and Young's modulus.
See also
External link
- Conversion Calculator for Units of Pressure (http://www.ex.ac.uk/trol/scol/ccpress.htm)
- Pressure measurement primer (http://www.aeroconsystems.com/electronics/Pressure_transducer_basics/Transducer_primer.htm)