Tlak Psi
Pound per square inch ili funta po kvadratnom palcu je Anglosaksonska mjera za tlak.
Nekada je bila vrlo rasprostranjena, a danas se na velikom području (osim USA) zamjenjuje SI sustavom.
Odnos prema drugim jedinicama za tlak prikazan je u tablici:
| paskal | bar | tehnička atmosfera | standardna atmosfera | torr (mmHg) | funta sile po četvornom palcu | |
|---|---|---|---|---|---|---|
| 1 Pa | ≡ 1 N/m² | = 10−5 bar | ≈ 10,197·10−6 at | ≈ 9,8692·10−6 atm | ≈ 7,5006·10−3 torr | ≈ 145,04·10−6 psi |
| 1 bar | = 100 000 Pa | ≡ 106 din/cm² | ≈ 1,0197 at | ≈ 0,98692 atm | ≈ 750,06 torr | ≈ 14,504 psi |
| 1 at | = 98 066,5 Pa | = 0,980665 bar | ≡ 1 kp/cm² | ≈ 0,96784 atm | ≈ 735,56 torr | ≈ 14,223 psi |
| 1 atm | = 101 325 Pa | = 1,01325 bar | ≈ 1,0332 at | ≡ 101 325 Pa | = 760 torr | ≈ 14,696 psi |
| 1 torr | ≈ 133,322 Pa | ≈ 1,3332·10−3 bar | ≈ 1,3595·10−3 at | ≈ 1,3158·10−3 atm | ≡ 1 mmHg | ≈ 19,337·10−3 psi |
| 1 psi | ≈ 6894,76 Pa | ≈ 68,948·10−3 bar | ≈ 70,307·10−3 at | ≈ 68,046·10−3 atm | ≈ 51,715 torr | ≡ 1 lbf/in² |
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