In industrial process engineering, pressure measurement is critical for system safety and efficiency. The bar is a metric unit of pressure defined as exactly 100,000 pascals. It is widely used in industrial instrumentation, hydraulic systems, and atmospheric monitoring because it is close to standard atmospheric pressure.
The Torr, named after Evangelista Torricelli, is a non-SI unit of pressure defined as exactly 1/760 of a standard atmosphere. It is the standard unit used in vacuum engineering and high-vacuum systems.
Bar: Commonly used in pneumatic systems and industrial process control.
Torr: Essential for vacuum technology, thin-film deposition, and laboratory research.
To convert between these units, we use the relationship \(1 \text{ bar} \approx 750.0615 \text{ Torr}\). This conversion is vital when transitioning from high-pressure process lines to vacuum-based analytical equipment.
Bar to Torr Conversion Reference Table
Bar (bar)
Torr (Torr)
0.1
75.0062
0.5
375.0308
1.0
750.0615
2.0
1500.123
5.0
3750.3075
10.0
7500.6151
20.0
15001.2301
50.0
37503.0753
100.0
75006.1505
500.0
375030.7525
1000.0
750061.505
Conversion Example: 10 Bar to Torr
To convert a pressure value from bar to Torr, multiply the bar value by the conversion factor of 750.0615050434136.
The Torr is preferred in vacuum science because it is historically linked to the mercury manometer. One Torr is approximately equal to the pressure exerted by a 1 mm column of mercury, making it highly intuitive for vacuum gauge calibration.
Yes, the conversion factor 750.0615050434136 is derived from the definition of the bar (100,000 Pa) and the standard atmosphere (101,325 Pa). Since both are defined by exact SI values, the conversion factor is mathematically precise.
"On fait la science avec des faits, comme on fait une maison avec des pierres ; mais une accumulation de faits n'est pas plus une science qu'un tas de pierres n'est une maison." "Science is built up of facts, as a house is built of stones; but an accumulation of facts is no more a science than a heap of stones is a house." — Henri Poincaré (French Mathematician, Theoretical Physicist & Mining Engineer)