Convert pressure units — Pascal, bar, PSI, atm, Torr, mmHg.
| Unit | Name | Value |
|---|---|---|
| Pa | Pascal | 133.322 |
| kPa | Kilopascal | 0.133322 |
| bar | Bar | 0.00133322 |
| atm | Atmosphere | 0.0013157858 |
| psi | PSI | 0.019336714 |
| inHg | Inch of Mercury | 0.039369949 |
Formula: Atmosphere = Torr × 0.001316
Multiply any torr value by 0.001316 to get atmosphere.
Reverse: Torr = Atmosphere × 760
Common torr values — factor: 1 Torr = 0.001316 atm
| Torr (Torr) | Atmosphere (atm) | Context |
|---|---|---|
| 0.001 Torr | 1.316e-06 atm | Ultra-high vacuum |
| 0.01 Torr | 1.316e-05 atm | High vacuum |
| 0.1 Torr | 0.0001316 atm | Medium vacuum |
| 1 Torr | 0.001316 atm | Low vacuum |
| 10 Torr | 0.01316 atm | Rough vacuum |
| 100 Torr | 0.1316 atm | Near-vacuum |
| 760 Torr | 1 atm | 1 atm / sea level |
| 1,000 Torr | 1.316 atm | Slight above atm |
| 7,600 Torr | 10 atm | 10 atm |
| 1e+04 Torr | 13.16 atm | 100 mbar |
| 7.6e+04 Torr | 100 atm | 100 atm |
| 100,000 Torr | 131.6 atm | 1.3 atm |
| 760,000 Torr | 1,000 atm | 1,000 atm |
| 1,000,000 Torr | 1,316 atm | High pressure |
| 10,000,000 Torr | 1.316e+04 atm | Very high |
1 Torr = 0.001316 atm. Memorize for instant estimates.
Use 0.0013 as a quick mental multiplier.
Multiply result by 760 to recover the original Torr value.
Uses atmospheres in gas law calculations (PV = nRT) and solubility studies.
Calculates dive depth pressure (every 10 m adds ~1 atm) for dive tables.
Designs diamond anvil cell experiments measuring pressure in thousands of atm.
Specifies autoclave and reactor operating pressures relative to atm.
Estimates metamorphic rock formation pressures in kbar (thousands of atm).
Plans saturation diving operations using atm for depth-pressure calculations.
The torr was named after Evangelista Torricelli, who invented the mercury barometer in 1644. One torr is defined as 1/760 of standard atmospheric pressure (133.322 Pa), and is equal to 1 mmHg at 0°C.
Torr is the standard pressure unit in vacuum science and semiconductor manufacturing. High vacuum systems operate at 10⁻³ to 10⁻⁷ torr. Ultra-high vacuum (used in particle accelerators) reaches below 10⁻¹⁰ torr.
Interesting fact: Torricelli's original barometer experiment used a 1-meter tube of mercury that settled at 760 mm above the reservoir — directly defining the unit that would later bear his name.
The atmosphere (atm) is defined as exactly 101,325 pascals — the approximate air pressure at sea level. It was originally defined as the average atmospheric pressure at sea level at 45° latitude, and has been a standard reference since the 17th century.
Atmospheres are used in chemistry (gas laws), scuba diving depth calculations (every 10 m of water ≈ 1 additional atm), and as a convenient reference for extreme pressure comparisons.
Interesting fact: Jupiter's atmosphere has pressures exceeding 1,000 atm at depth. Diamond formation in Earth's mantle requires pressures of 45,000–60,000 atm at depths of 150–200 km.
Converting torr to atmosphere is a common task in engineering, medicine, meteorology, and science. Different industries and countries use different pressure units — PSI in the US, bar in Europe, mmHg in medicine, and pascals in physics — making accurate conversion essential for cross-disciplinary work.
Quick reference: 5 Torr = 0.006579 atm and 10 Torr = 0.01316 atm. For the reverse: 1 atm = 760 Torr. The exact factor is 1 Torr = 0.001316 atm.
All conversions use IEEE 754 double-precision arithmetic, accurate to at least 8 significant figures.