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Psidial

A pressure gauge reading in psi (red scale) and kPa (black scale)

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


See also Edit

References Edit


External links Edit

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