Convert Technical Atmospheres to Torr
Convert Technical Atmospheres (at) to Torr (Torr) instantly and accurately.
Conversion Formula
Torr = at × 735.5592401
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 Torr
The torr is defined as exactly 1/760 of a standard atmosphere ≈ 133.322 Pa - effectively replacing mmHg with an exact definition. Named after Evangelista Torricelli (1608-1647), inventor of the barometer. Vacuum science universally uses torr: rough vacuum 760-1 torr; medium vacuum 1-10⁻³ torr; high vacuum 10⁻³-10⁻⁷ torr; ultra-high vacuum below 10⁻⁹ torr. UHV systems for surface science, particle accelerator beam tubes, and space simulation chambers reach 10⁻¹¹-10⁻¹² torr. 1 torr = 133.322 Pa.
Quick Reference Table
| Technical Atmospheres (at) | Torr (Torr) |
|---|---|
| 1 at | 735.559 Torr |
| 2 at | 1471.12 Torr |
| 5 at | 3677.8 Torr |
| 10 at | 7355.59 Torr |
| 25 at | 18389 Torr |
| 50 at | 36778 Torr |
| 100 at | 73555.9 Torr |