Pressure
Convert bar (bar) to millimetre of mercury (mmHg). Pressure is force per unit area. Process engineers move constantly between SI (kPa, bar) and US (psi) units, and between absolute and gauge.
1 bar = 750.0616 mmHg
To convert bar to millimetre of mercury, multiply the bar value by 750.0616. To go the other way, divide by 750.0616 (or multiply by 0.001333224).
| bar | mmHg |
|---|---|
| 1 | 750.0616 |
| 2 | 1500.123 |
| 5 | 3750.308 |
| 10 | 7500.616 |
| 25 | 18751.54 |
| 50 | 37503.08 |
| 100 | 75006.16 |
| 250 | 187515.4 |
| 500 | 375030.8 |
| 1000 | 750061.6 |
Line and vessel ratings, pump discharge heads, and relief set points are all specified in pressure units — usually psi or barg in the field and kPa in calculations.
Always track whether a value is absolute or gauge: 0 barg equals about 101.3 kPa absolute, and mixing the two is a common and costly error.
Worked example. A pressure of 10 bar is 7500.616 mmHg.
Multiply the value in bar by 750.0616 to get mmHg. For example, 10 bar = 7500.616 mmHg.
1 bar equals 750.0616 mmHg.
Line and vessel ratings, pump discharge heads, and relief set points are all specified in pressure units — usually psi or barg in the field and kPa in calculations.