Convert Pounds per Square Inch to Technical Atmospheres
Convert Pounds per Square Inch (psi) to Technical Atmospheres (at) instantly and accurately.
Conversion Formula
at = psi × 0.07030695796
About Pounds per Square Inch
One pound per square inch (psi) ≈ 6,894.76 Pa - the dominant pressure unit in US industry and consumer products. Car tyres: 32-36 psi; truck tyres 80-120 psi; bicycle road tyres 80-130 psi. Home water supply: 40-80 psi; residential maximum 80 psi per plumbing code. Compressed air tools: 90-150 psi. Steam autoclave sterilisation: 15-30 psi. The distinction between gauge (psig) and absolute (psia) pressure is critical: gauge pressure is relative to ambient; absolute = gauge + ~14.696 psi. 1 psi = 6,894.76 Pa.
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.
Quick Reference Table
| Pounds per Square Inch (psi) | Technical Atmospheres (at) |
|---|---|
| 1 psi | 0.070307 at |
| 2 psi | 0.140614 at |
| 5 psi | 0.351535 at |
| 10 psi | 0.70307 at |
| 25 psi | 1.75767 at |
| 50 psi | 3.51535 at |
| 100 psi | 7.0307 at |