Convert Technical Atmospheres to Standard Atmospheres
Convert Technical Atmospheres (at) to Standard Atmospheres (atm) instantly and accurately.
Conversion Formula
atm = at × 0.9678411054
About Technical Atmospheres
One technical atmosphere (at) = exactly 1 kgf/cm² = 98,066.5 Pa ≈ 0.968 standard atmospheres. The metric technical pressure unit used in pre-SI European and Japanese engineering for boilers, hydraulic cylinders, and compressed gas systems. A steam boiler at 10 at operates at 0.981 MPa; hydraulic presses are rated at 200-600 at. Still used parenthetically in old German and Japanese machinery manuals and standards (DIN 1301-3 legacy). Converts simply from kgf/cm²: 1 at ≡ 1 kgf/cm². 1 at = 98,066.5 Pa.
About Standard Atmospheres
The standard atmosphere (atm) = exactly 101,325 Pa - defined by the 10th CGPM (1954) as the reference air pressure at sea level. Used to define STP (0°C and 1 atm) for gas law and thermochemistry. Chemical equilibrium constants (Kp), Henry's law solubility, and thermodynamic tables are tabulated at 1 atm. ISA aviation standard: sea-level 1 atm / 15°C, pressure halving every ~5.5 km. Diving physics: +1 atm per 10 m depth (fresh water) so 30 m = 4 atm absolute. Diamond formation in Earth's mantle: ~50,000 atm. 1 atm = 101,325 Pa.
Quick Reference Table
| Technical Atmospheres (at) | Standard Atmospheres (atm) |
|---|---|
| 1 at | 0.967841 atm |
| 2 at | 1.93568 atm |
| 5 at | 4.83921 atm |
| 10 at | 9.67841 atm |
| 25 at | 24.196 atm |
| 50 at | 48.3921 atm |
| 100 at | 96.7841 atm |