Bar to Torr Converter
Common Conversions
| bar | torr |
|---|---|
| 0.01 | 7.501 |
| 0.05 | 37.503 |
| 0.1 | 75.006 |
| 0.25 | 187.516 |
| 0.5 | 375.031 |
| 1 | 750.062 |
| 1.01325 | 760 |
| 2 | 1500.124 |
| 5 | 3750.31 |
| 10 | 7500.62 |
| 20 | 15001.24 |
Why this conversion matters in chemistry
High-vacuum and surface-science work has historically run in torr; modern instrumentation increasingly carries bar-based alarms and setpoints. The factor between them is 750.062 torr per bar — a number that falls out of 1 bar = 100,000 Pa and 1 torr = 133.322 Pa. An ultrahigh-vacuum chamber at 10⁻¹⁰ bar sits at 7.5 × 10⁻⁸ torr, the working pressure where residual-gas adsorption onto a clean single-crystal surface starts to compromise an XPS or LEED measurement. The same factor lets a rotary-evaporator solvent table (in torr) meet a modern instrument controller setpoint (in bar).
Formula
Worked Examples
The IUPAC reference pressure expressed in torr — slightly below the 760 torr standard atmosphere.
One standard atmosphere — the calibration anchor that links the two scales through the mmHg history.
A working pressure in the rotary-evaporator range for many common solvents.
A modest reduced pressure — the kind a rotavap might pull on a higher-boiling solvent.