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The pound per square inch (abbreviation: psi) or, more accurately, pound-force per square inch (symbol: lbf/in 2), [1] is a unit of measurement of pressure or of stress based on avoirdupois units and used primarily in the United States. It is the pressure resulting from a force with magnitude of one pound-force applied to an area of one square ...
Unit type Unit code Unit name Area: a: are: m2: square metre Charge: coulomb: coulomb Energy: J: joule Force: N: newton Length: m: metre Magnetic field strength: T ...
kn ≡ 1 nmi/h = 1.852 km/h ... psi ≡ 1 lbf/in 2: ≈ 6.894 757 ... pound-force second per square foot: lbf⋅s/ft 2: ≡ 1 lbf⋅s/ft 2:
The pound-force is the product of one avoirdupois pound (exactly 0.45359237 kg) and the standard acceleration due to gravity, approximately 32.174049 ft/s 2 (9.80665 m/s 2). [ 5 ] [ 6 ] [ 7 ] The standard values of acceleration of the standard gravitational field ( g n ) and the international avoirdupois pound (lb) result in a pound-force equal ...
1.0 kN (220 lb f) kN LT-f; kN LTf; kN ST-f; kN STf; newton: N N 1.0 N (0.22 lb f) N lb-f; N lbf; N oz-f; N ozf; millinewton: mN mN 1.0 mN (0.0036 oz f) mN oz-f; mN ozf; mN gr-f; mN grf; micronewton: μN (uN) μN 1.0 μN (0.0016 gr f) μN gr-f; μN grf; nanonewton: nN nN 1.0 nN (1.6 × 10 −6 gr f) nN gr-f; nN grf; cgs: megadyne: Mdyn Mdyn 1.0 ...
The pascal (Pa) or kilopascal (kPa) as a unit of pressure measurement is widely used throughout the world and has largely replaced the pounds per square inch (psi) unit, except in some countries that still use the imperial measurement system or the US customary system, including the United States.
Units for other physical quantities are derived from this set as needed. In English Engineering Units, the pound-mass and the pound-force are distinct base units, and Newton's Second Law of Motion takes the form = where is the acceleration in ft/s 2 and g c = 32.174 lb·ft/(lbf·s 2).
120–290 psi Pressure used in boilers of steam locomotives [citation needed] 1.1 MPa 162 psi Pressure of an average human bite [citation needed] 2.8–8.3 MPa 400–1,200 psi Pressure of carbon dioxide propellant in a paintball gun [64] 5 MPa 700 psi Water pressure of the output of a coin-operated car wash spray nozzle [58] 5 MPa 700 psi