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 This page uses content from the English Wikipedia. The original article was at Pounds per square inch. The list of authors can be seen in the page history. As with the Units of Measurement Wiki, the text of Wikipedia is available under Creative Commons License see Wikia:Licensing.

The pound per square inch or, more accurately, pound-force per square inch (symbol: psi or lbf/in2 or lbf/in2 or lbf/sq in or lbf/sq in) is a unit of pressure or of stress based on avoirdupois units. It is the pressure resulting from a force of one pound-force applied to an area of one square inch:

One pound per square inch approximately equals 6894.757 Pa.

## Magnitude Edit

Main article: Orders of magnitude (pressure)
• Blood Pressure – Average human blood pressure (120/80): 2.32psi/1.55psi
• Boost Pressure Provided By an Automotive Turbocharger(common):Pg = 6–15psi
• Atmospheric pressure at sea level (standard): Pa = 14.7 psi
• Automobile tire overpressure (common): Pg = 32 psi
• Bicycle tire overpressure (common): Pg = 65 psi
• Workshop or garage air tools: Pg = 90 psi
• Air brake (rail) or Air brake (road vehicle) reservoir overpressure (common): 90 psi ≤ Pg ≤ 120 psi
• Road racing bicycle tire overpressure: Pg = 120 psi
• Steam locomotive fire tube boiler (UK, 20th century): 150 psi ≤ Pg ≤ 280 psi
• Union Pacific Big Boy steam locomotive boiler: 300 psi
• Natural gas pipelines: 800 to 1000 psi
• Full SCBA Self Contained Breathing Apparatus for toxic atmospheres: 2216 psi
• Full scuba tank overpressure (common): Pg = 3000 psi
• Commercial jet airliner hydraulic pressure: 3000 psi
• Airbus A380 hydraulic system: 5000 psi
• Water jet cutter: 40,000–100,000 psi
• Young's Modulus for steel: 30 Mpsi or 30,000,000 psi

## Conversions Edit

Pressure units

v · d · e

pascal bar technical atmosphere standard atmosphere torr pound per square inch
Pa bar at atm Torr psi
1 Pa ≡ 1 N/m2 10−5 1.0197×10−5 9.8692×10−6 7.5006×10−3 145.04×10−6
1 bar 105 ≡ 106 dyn/cm2 1.0197 0.98692 750.06 14.5037744
1 at 0.980665 ×105 0.980665 ≡ 1 kp/cm2 0.96784 735.56 14.223
1 atm 1.01325 ×105 1.01325 1.0332 p0 760 14.696
1 Torr 133.322 1.3332×10−3 1.3595×10−3 1.3158×10−3 = 1 mmHg 19.337×10−3
1 psi 6.895×103 68.948×10−3 70.307×10−3 68.046×10−3 51.715 ≡ 1 lbF/in2