Multiples The kilopound per square inch (ksi) is a scaled unit derived from psi, equivalent to a thousand psi (1000 lbf/in2). ksi are not widely used for gas pressures. They are mostly used in materials science, where the tensile strength of a material is measured as a large number of psi.[4] The conversion in SI Units is 1 ksi = 6.895 MPa, or 1 MPa = 0.145 ksi. The megapound per square inch (Mpsi) is another multiple equal to a million psi. It is used in mechanics for the elastic modulus of materials, especially for metals.[5] The conversion in SI Units is 1 Mpsi = 6.895 GPa, or 1 GPa = 0.145 Mpsi.

Magnitude Main article: Orders of magnitude (pressure) Inch of water: 0.036 psid Blood pressure – clinically normal human blood pressure (120/80 mmHg): 2.32 psig/1.55 psig Natural gas residential piped in for consumer appliance; 4–6 psig. Boost pressure provided by an automotive turbocharger (common): 6–15 psig NFL football: 12.5–13.5 psig Atmospheric pressure at sea level (standard): 14.7 psia Automobile tire overpressure (common): 32 psig Bicycle tire overpressure (common): 65 psig Workshop or garage air tools: 90 psig Air brake (rail) or air brake (road vehicle) reservoir overpressure (common): 90–120 psig Road racing bicycle tire overpressure: 120 psig Steam locomotive fire tube boiler (UK, 20th century): 150–280 psig Union Pacific Big Boy steam locomotive boiler: 300 psig Natural gas pipelines: 800–1000 psig Full SCBA (self-contained breathing apparatus) for IDLH (non-fire) atmospheres: 2216 psig Full SCUBA (self-contained underwater breathing apparatus) tank overpressure (common): 3000 psig Full SCBA (self-contained breathing apparatus) for interior firefighting operations: 4500 psig Airbus A380 hydraulic system: 5000 psig Ultimate strength of ASTM A36 steel: 58,000 psi Water jet cutter: 40,000–100,000 psig

Conversions Pressure units v t e Pascal Bar Technical atmosphere Standard atmosphere Torr Pounds per square inch (Pa) (bar) (at) (atm) (Torr) (lbf/in2) 1 Pa ≡ 1 N/m2 10−5 6995101970000000000♠1.0197×10−5 6994986919999999999♠9.8692×10−6 6997750060000000000♠7.5006×10−3 6996145037700000000♠1.450377×10−4 1 bar 105 ≡ 100 kPa ≡ 106 dyn/cm2 7000101970000000000♠1.0197 6999986920000000000♠0.98692 7002750060000000000♠750.06 7001145037700000000♠14.50377 1 at 7004980665000000000♠9.80665×104 6999980665000000000♠0.980665 ≡ 1 kgf/cm2 6999967841100000000♠0.9678411 7002735559200000000♠735.5592 7001142233400000000♠14.22334 1 atm 7005101325000000000♠1.01325×105 7000101325000000000♠1.01325 7000103319999999999♠1.0332 1 ≡ 7002760000000000000♠760 7001146959500000000♠14.69595 1 Torr 7002133322399999999♠133.3224 6997133322400000000♠1.333224×10−3 6997135955100000000♠1.359551×10−3 ≡ 1/760 ≈ 6997131578900000000♠1.315789×10−3 ≡ 1 Torr ≈ 1 mmHg 6998193367800000000♠1.933678×10−2 1 lbf/in2 7003689480000000000♠6.8948×103 6998689480000000000♠6.8948×10−2 6998703069000000000♠7.03069×10−2 6998680460000000000♠6.8046×10−2 7001517149300000000♠51.71493 ≡ 1 lbf /in2

References ^ IEEE Standard Letter Symbols for Units of Measurement (SI Units, Customary Inch-Pound Units, and Certain Other Units), IEEE Std 260.1™-2004 (Revision of IEEE Std 260.1-1993) ^ "Glossary of Industrial Air Cleaning Technology". United Air Specialists, Inc. Archived from the original on August 1, 2011.  ^ "Gage v. Sealed v. Absolute pressure" (PDF). Dynisco.  ^ "Tensile Strength of Steel and Other Metals". All Metals & Forge Group. Retrieved 2016-07-26. A metal’s yield strength and ultimate tensile strength values are expressed in tons per square inch, pounds per square inch or thousand pounds (KSI) per square inch. For example, a tensile strength of a steel that can withstand 40,000 pounds of force per square inch may be expressed as 40,000 PSI or 40 KSI (with K being the [multiplier] for thousands of pounds). The tensile strength of steel may also be shown in MPa, or megapascal.  ^ An example of the use of Mpsi in mechanics for the elastic moduli of several materials

External links Pressure measurement primer Online pressure conversions ksi to psi conversions Retrieved from "https://en.wikipedia.org/w/index.php?title=Pounds_per_square_inch&oldid=830900391" Categories: Units of pressureCustomary units of measurement in the United StatesImperial units