Bar to Torr Conversion Chart
| Bar (bar) | Torr (mmHg) (mmHg) | Reference Benchmark | Formula Step |
|---|---|---|---|
| 0.001 bar | 0.750062 mmHg | Mechanical Rotary Vane Vacuum Foreline Pressure Level | 0.001 × 750.0615 = 0.750062 torr |
| 0.001333224 bar | 1 mmHg | Exact One Torr Classical Mercury Definition Standard | 0.001333224 × 750.0615 = 1 torr |
| 0.005 bar | 3.750308 mmHg | Industrial Freeze-Drying Desiccation Vacuum Chamber | 0.005 × 750.0615 = 3.750308 torr |
| 0.01 bar | 7.500615 mmHg | Laboratory Rotary Evaporator Solvent Stripping Line | 0.01 × 750.0615 = 7.500615 torr |
| 0.02 bar | 15.00123 mmHg | Water Vapor Saturation Partial Pressure at Room Temp (22°C) | 0.02 × 750.0615 = 15.00123 torr |
| 0.05 bar | 37.50308 mmHg | Water Vapor Saturation Pressure at Ambient 33°C Level | 0.05 × 750.0615 = 37.50308 torr |
| 0.1 bar | 75.00615 mmHg | High Altitude Weather Sounding Atmospheric Enclosure | 0.1 × 750.0615 = 75.00615 torr |
| 0.2 bar | 150.0123 mmHg | Partial Pressure Oxygen Human Respiratory Safety Limit | 0.2 × 750.0615 = 150.0123 torr |
| 0.5 bar | 375.0308 mmHg | Half Standard Atmospheric Barometric Mercury Height | 0.5 × 750.0615 = 375.0308 torr |
| 1 bar | 750.0615 mmHg | Exactly One Metric Bar in Mercury Column Equivalent | 1 × 750.0615 = 750.0615 torr |
| 1.01325 bar | 760 mmHg | Standard International Barometric Sea Level Column | 1.01325 × 750.0615 = 760 torr |
| 1.5 bar | 1125.092 mmHg | Pressurized Autoclave Decontamination Mercury Level | 1.5 × 750.0615 = 1125.092 torr |
| 2 bar | 1500.123 mmHg | Automotive Tire Cold Inflation Mercury Scale Equivalent | 2 × 750.0615 = 1500.123 torr |
| 3 bar | 2250.185 mmHg | Municipal Potable Water Line in Mercury Column Height | 3 × 750.0615 = 2250.185 torr |
| 5 bar | 3750.308 mmHg | Scuba Diving Intermediate Stage Regulator Mercury Level | 5 × 750.0615 = 3750.308 torr |
Bar to Torr (mmHg) Formula & Unit Definitions
The exact mathematical relationship states that 1 standard atmosphere = 1.01325 bar = 760 torr. Therefore, 1 bar equals 760 ÷ 1.01325 ≈ 750.061505 torr. To convert bar to torr, multiply the bar reading by 750.0615 (or divide by 0.001333224). To convert torr back into bar, multiply the torr figure by 0.001333224 (or divide by 750.0615).
Quick Estimation: Multiply the bar value by 750. For example, 2 bar × 750 = 1,500 torr (exact is 1,500.12 torr); 0.1 bar × 750 = 75 torr (exact is 75.01 torr).
Bar Standard (bar)
Metric Industrial Unit- Creator & Origin: Introduced in 1909 by British meteorologist William Napier Shaw as a clean metric power of ten (10⁵ Pa).
- Standard Definition: Defined under international metrology as exactly 100,000 pascals (100 kPa or 0.1 MPa).
- Everyday Focus: Shop air compressors (6-10 bar), commercial espresso extraction (9 bar), and hydraulic ram circuits.
Torr Standard (Torr / mmHg)
Classical Vacuum Baseline- Creator & Origin: Named in 1954 in honor of Evangelista Torricelli, inventor of the liquid mercury barometer.
- Standard Definition: Defined as exactly 1/760 of a standard atmosphere (101,325 ÷ 760 ≈ 133.3224 Pa).
- Everyday Focus: Pharmaceutical vacuum freeze-dryers, semiconductor plasma deposition, and clinical blood pressure (mmHg).
Frequently Asked Questions
Q.How many torr are in one bar?
One bar equals approximately 750.0615 torr (or mmHg).
Q.What is the reverse conversion from torr to bar?
To convert back, use the Torr to Bar Converter where 1 torr equals ~0.00133322 bar.
Q.What is 1 bar in mmHg?
Because 1 torr equals 1 mmHg, 1 bar equals approximately 750.06 mmHg.
Q.Why does 1 atm equal 760 torr while 1 bar equals 750 torr?
Because 1 standard atmosphere (101,325 Pa) is slightly larger than 1 bar (100,000 Pa). The ratio is 760 × (100,000 ÷ 101,325) ≈ 750.0615 torr.
Q.What is mbar in relation to torr?
1 millibar (mbar = 0.001 bar) equals approximately 0.75006 torr.