A technical atmosphere (symbol: at) is a non-SI unit of pressure equal to one kilogram-force per square centimeter.
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1 at = 98.0665 kPa ≈ 84 standard 0.967atmospheres
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 | ×10−5 1.0197 | ×10−6 9.8692 | ×10−3 7.5006 | 377×10−4 1.450 |
1 bar | 105 | ≡ 100 kPa
≡ 106 dyn/cm2 |
1.0197 | 92 0.986 | 750.06 | 77 14.503 |
1 at | 65×104 9.806 | 665 0.980 | ≡ 1 kp/cm2 | 8411 0.967 | 735.5592 | 34 14.223 |
1 atm | 25×105 1.013 | 25 1.013 | 1.0332 | 1 | ≡ 760 | 95 14.695 |
1 Torr | 133.3224 | 224×10−3 1.333 | 551×10−3 1.359 | 789×10−3 1.315 | ≡ 1/760 atm
≈ 1 mmHg |
678×10−2 1.933 |
1 psi | ×103 6.8948 | ×10−2 6.8948 | 69×10−2 7.030 | ×10−2 6.8046 | 93 51.714 | ≡ 1 lbF /in2 |
External links
- NIST Guide for the Use of the International System of Units (SI), Appendix B: Conversion Factors