Technical atmosphere
A technical atmosphere (symbol: at) is a non-SI unit of pressure equal to one kilogram-force per square centimeter.
1 at = 98.0665 kPa ≈ 0.96784 standard atmospheres
The symbol "at" clashes with that of the katal (symbol: "kat"), the SI unit of catalytic activity; a kilotechnical atmosphere would have the symbol "kat", indistinguishable from the symbol for the katal. It also clashes with that of the non-SI unit, the attotonne, but that unit would be more likely be rendered as the equivalent SI unit, the picogram.
| Pascal | Bar | Technical atmosphere | Standard atmosphere | Torr | Pounds 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 | 1.450377×10−4 |
| 1 bar | 105 | ≡ 100 kPa
≡ 106 dyn/cm2 |
1.0197 | 0.98692 | 750.06 | 14.50377 |
| 1 at | 9.80665×104 | 0.980665 | ≡ 1 kp/cm2 | 0.9678411 | 735.5592 | 14.22334 |
| 1 atm | 1.01325×105 | 1.01325 | 1.0332 | 1 | ≡ 760 | 14.69595 |
| 1 Torr | 133.3224 | 1.333224×10−3 | 1.359551×10−3 | ≡ 1/760 ≈ 1.315789×10−3 | ≡ 1 Torr
≈ 1 mmHg |
1.933678×10−2 |
| 1 psi | 6.8948×103 | 6.8948×10−2 | 7.03069×10−2 | 6.8046×10−2 | 51.71493 | ≡ 1 lbf /in2 |
External links
- NIST Guide for the Use of the International System of Units (SI), Appendix B: Conversion Factors
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