Convert Pounds per Square Inch to Torr
Convert Pounds per Square Inch (psi) to Torr (Torr) instantly and accurately.
Conversion Formula
Torr = psi × 51.71493257
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 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
| Pounds per Square Inch (psi) | Torr (Torr) |
|---|---|
| 1 psi | 51.7149 Torr |
| 2 psi | 103.43 Torr |
| 5 psi | 258.575 Torr |
| 10 psi | 517.149 Torr |
| 25 psi | 1292.87 Torr |
| 50 psi | 2585.75 Torr |
| 100 psi | 5171.49 Torr |