A technical atmosphere (symbol: at) is a non-SI unit of pressure equal to one kilogram-force per square centimeter. Pressure (symbol 'p' is the force per unit Area applied to an object in a direction perpendicular to the surface The unit kilogram-force ( kgf, often incorrectly just kg) or kilopond ( kp) is defined as the Force exerted by Earth's gravity
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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. The Standard atmosphere is an international reference pressure defined as 101325 Pa and formerly used as unit of Pressure (symbol atm The katal (symbol kat is the SI unit of catalytic activity It is a derived SI unit for expressing quantity values of catalytic activity of Enzymes 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. This article is about the tonne or metric ton For other tons see Ton.
pascal (Pa) |
bar (bar) |
technical atmosphere (at) |
atmosphere (atm) |
torr (Torr) |
pound-force per square inch (psi) |
|
|---|---|---|---|---|---|---|
| 1 Pa | ≡ 1 N/m2 | 10−5 | 1. The bar (symbol bar) decibar (symbol dbar) and the millibar (symbol mbar, also mb are units of Pressure. The Standard atmosphere is an international reference pressure defined as 101325 Pa and formerly used as unit of Pressure (symbol atm The torr (symbol Torr) is a non- SI unit of Pressure defined as 1/760 of an atmosphere. The pound per square inch or more accurately pound-force per square inch (symbol psi or lbf/in² or lbf/in²) is a unit of The newton (symbol N) is the SI derived unit of Force, named after Isaac Newton in recognition of his work on Classical 0197×10−5 | 9. 8692×10−6 | 7. 5006×10−3 | 145. 04×10−6 |
| 1 bar | 100,000 | ≡ 106 dyn/cm2 | 1. 0197 | 0. 98692 | 750. 06 | 14. 504 |
| 1 at | 98,066. 5 | 0. 980665 | ≡ 1 kgf/cm2 | 0. The unit kilogram-force ( kgf, often incorrectly just kg) or kilopond ( kp) is defined as the Force exerted by Earth's gravity 96784 | 735. 56 | 14. 223 |
| 1 atm | 101,325 | 1. 01325 | 1. 0332 | ≡ 1 atm | 760 | 14. The Standard atmosphere is an international reference pressure defined as 101325 Pa and formerly used as unit of Pressure (symbol atm 696 |
| 1 torr | 133. 322 | 1. 3332×10−3 | 1. 3595×10−3 | 1. 3158×10−3 | ≡ 1 Torr; ≈ 1 mmHg | 19. The torr (symbol Torr) is a non- SI unit of Pressure defined as 1/760 of an atmosphere. 337×10−3 |
| 1 psi | 6,894. 76 | 68. 948×10−3 | 70. 307×10−3 | 68. 046×10−3 | 51. 715 | ≡ 1 lbf/in2 |
Example reading: 1 Pa = 1 N/m2 = 10−5 bar = 10. This article deals with the unit of force For the unit of mass see Pound (mass. 197×10−6 at = 9. 8692×10−6 atm, etc.
Note: mmHg is an abbreviation for millimeters of mercury.
External links
- NIST Guide for the Use of the International System of Units (SI), Appendix B: Conversion Factors
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