Atmospheres (atm) to Torr (Torr) Conversion
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).
Torr
The torr is a unit of pressure named after Evangelista Torricelli, the Italian physicist who invented the mercury barometer in 1643. One torr is defined as exactly 1/760 of a standard atmosphere (approximately 133.322 Pa). Numerically nearly identical to the millimetre of mercury (mmHg), it differs by less than 0.000015%. The torr is used in vacuum science and engineering: rough vacuum is 1–100 torr, fine vacuum 10⁻³–1 torr, and ultra-high vacuum below 10⁻⁹ torr.
| Atmospheres (atm) | Torr (Torr) |
|---|---|
| 0.1 atm | 76.00 Torr |
| 1 atm | 760.00 Torr |
| 2 atm | 1,520.00 Torr |
| 3 atm | 2,280.00 Torr |
| 5 atm | 3,800.00 Torr |
| 10 atm | 7,600.00 Torr |
| 20 atm | 15,200.00 Torr |
| 30 atm | 22,800.00 Torr |
| 50 atm | 38,000.00 Torr |
| 100 atm | 76,000.00 Torr |
| 1000 atm | 760,000.00 Torr |
Frequently Asked Questions (FAQ)
How many torr are in 1 atmospheres?
1 atmospheres (atm) is exactly 760.000 torr (Torr).
How do I convert atmospheres to torr?
Multiply the value in atmospheres by 760.000 to get the result in torr. Or use the converter above — type any number and see the result instantly.