Bar (bar) to Atmospheres (atm) Conversion
Bar
The bar is a unit of pressure equal to exactly 100,000 pascals (100 kPa), accepted for use with the SI by the BIPM. It is close to one standard atmosphere (1 atm = 1.01325 bar) making it convenient for many practical applications. The bar is widely used in meteorology (weather maps), industrial gas and fluid systems, and tyre inflation in continental Europe. A typical car tyre is inflated to 2.2–2.5 bar; scuba diving tanks are filled to 200–300 bar.
Atmospheres
The standard atmosphere (atm) is a unit of pressure defined as exactly 101,325 Pa, representing the approximate mean atmospheric pressure at sea level. It remains in use in chemistry for expressing gas pressures in thermodynamic tables and standard conditions (STP: 0 °C and 1 atm). One atmosphere supports a mercury column of exactly 760 mm — the basis of the mercury barometer invented by Torricelli in 1643. In deep-sea diving, pressure is expressed in atmospheres absolute (ATA).
| Bar (bar) | Atmospheres (atm) |
|---|---|
| 0.1 bar | 0.0987 atm |
| 1 bar | 0.9869 atm |
| 2 bar | 1.9738 atm |
| 3 bar | 2.9608 atm |
| 5 bar | 4.9346 atm |
| 10 bar | 9.8692 atm |
| 20 bar | 19.7385 atm |
| 30 bar | 29.6077 atm |
| 50 bar | 49.3462 atm |
| 100 bar | 98.6923 atm |
| 1000 bar | 986.9233 atm |
Frequently Asked Questions (FAQ)
How many atmospheres are in 1 bar?
1 bar (bar) is exactly 0.986923 atmospheres (atm).
How do I convert bar to atmospheres?
Multiply the value in bar by 0.986923 to get the result in atmospheres. Or use the converter above — type any number and see the result instantly.