Atmospheres to Torr Converter
Common Conversions
| atm | torr |
|---|---|
| 0.0001 | 0.076 |
| 0.001 | 0.76 |
| 0.01 | 7.6 |
| 0.05 | 38 |
| 0.1 | 76 |
| 0.25 | 190 |
| 0.5 | 380 |
| 1 | 760 |
| 1.5 | 1140 |
| 2 | 1520 |
| 5 | 3800 |
| 10 | 7600 |
Why this conversion matters in chemistry
Atmospheres are how pressure gets written in a gas-law problem; torr is how it reads on a rotary-evaporator gauge or a Schlenk line. A textbook value of 1 atm is 760 torr by definition — the same number a mercury manometer would show at sea level, which is exactly where the unit came from. The conversion matters when a solvent table recommends running an evaporation at around 58 torr (a low vacuum for toluene at 40 °C) and the method section was written in atm, or when a Clausius-Clapeyron fit wants pressures in atm and the instrument only knows torr.
Formula
Worked Examples
Standard atmospheric pressure at sea level — the anchor point of the conversion.
Low vacuum — well below what a water aspirator can reach and into the territory of a membrane or rotary-vane pump.
Medium vacuum, where Schlenk-line chemistry with a diffusion or rotary-vane pump tends to operate.
Roughly atmospheric pressure at the summit of a 5500 m peak — half an atmosphere still supports chemistry, just not comfortably.