Convert torr to atmospheres and atmospheres to torr instantly. Bidirectional pressure converter with formula and common values.
To convert torr to atmospheres, divide by 760 (or multiply by 0.00131579). The torr was defined so that exactly 760 torr equals one standard atmosphere, based on the original mercury barometer measurement by Torricelli in 1643.
| Torr | Atmospheres |
|---|---|
| 50 | 0.0658 |
| 100 | 0.1316 |
| 250 | 0.3289 |
| 380 | 0.5000 |
| 500 | 0.6579 |
| 760 | 1.0000 |
| 1,520 | 2.0000 |
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Torr is a unit of pressure named after physicist Evangelista Torricelli. One torr is approximately equal to one millimeter of mercury (mmHg). The exact definition is 1 torr = 101,325/760 Pa.
Exactly 760 torr equals one standard atmosphere. This value originates from the height of a mercury column (760 mm) that atmospheric pressure supports at sea level.
Torr is primarily used in vacuum science, laboratory settings, and blood pressure measurement (as mmHg). High-vacuum systems often operate in the millitorr or microtorr range.
Low vacuum ranges from 760 to 25 torr. Medium vacuum is 25 to 0.001 torr. High vacuum is below 0.001 torr (1 millitorr). Ultra-high vacuum systems reach below 10⁻⁹ torr.