Pound-force per square inch
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(Redirected from Pounds-force per square inch)
- The abbreviation psi has multiple meanings; see Psi for other possibilities.
Pound-force per square inch (symbol: lbf/in²) is a non-SI unit of pressure.
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Definition
1 lbf/in² = 6 894.757 29 Pa
Explanation
The language dependent abbreviation psi is common in regions where English is spoken.
At 1 lbf/in², a force of one pound-force is applied to an area of one square inch.
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 stress and Young's modulus.
Context
- atmospheric pressure on the ocean's surface - 14.7 psia
- automobile tire - 32 psig
- air brake reservoir - 90 to 120 psig
- full scuba tank - 3000 psig
