Convert Atmospheres to Torr
Instantly convert Atmospheres (atm) to Torr (torr) with our free online calculator.
Formula: atm to torr — multiply by 760.002
Reference Table
| Atmospheres (atm) | Torr (torr) |
|---|---|
| 1 | 760.002 |
| 5 | 3800.01 |
| 10 | 7600.02 |
| 25 | 19000.1 |
| 50 | 38000.1 |
| 100 | 76000.2 |
How to Convert Atmospheres to Torr
Formula
To convert Atmospheres (atm) to Torr (torr): multiply by 760.002
Step-by-Step
- Start with your value in Atmospheres (atm).
- Multiply by 760.002 to perform the conversion.
- The result is your value expressed in Torr (torr).
Conversion Factor
1 atm = 760.002 torr
Reverse Factor
1 torr = 0.00131579 atm
Worked Example
Convert 25 Atmospheres to Torr: 25 atm = 19000.1 torr
About Atmosphere (atm)
A non-SI unit of pressure defined as exactly 101,325 pascals, corresponding to the standard sea-level atmospheric pressure as adopted by ISO 2533 and the BIPM SI Brochure. Atmospheres are the default reference pressure in physical chemistry (Standard Temperature and Pressure conventions: 1 atm at 273.15 K under IUPAC's 'STP' definition, though IUPAC has since moved to 1 bar STP), in commercial diving (depths are quoted in atmospheres absolute, with each 10 m of seawater adding ~1 atm), and in pressure-sensitive materials research where vapor pressure and saturation data are tabulated at 1 atm. A common pitfall: the "technical atmosphere" (at, 98,066.5 Pa = 1 kgf/cm²) used in some legacy European and Japanese engineering is NOT the same as the standard atmosphere — older pressure-vessel drawings can read 100 at and mean either depending on context. 1 atm = 1.01325 bar = 14.696 psi = 760 mmHg = 760 torr.
About Torr (torr)
A unit of pressure defined as exactly 1/760 of a standard atmosphere (≈ 133.322 Pa). Named after 17th-century physicist Evangelista Torricelli, who in 1643 invented the mercury barometer while studying why suction-lift pumps fail above ~10 m — establishing that the atmosphere itself has weight. The torr is the primary unit in modern vacuum technology and semiconductor fabrication: a "rough vacuum" is ~1 torr, "medium vacuum" 10⁻³ torr (typical of mechanical-pump-only systems), "high vacuum" 10⁻⁶ torr (achievable with turbomolecular pumps, used in mass spectrometry and electron microscopy), and "ultrahigh vacuum" (UHV) 10⁻⁹ torr or lower (semiconductor MBE, surface science, particle accelerators). Manufacturing fabs quote chamber pressures in torr or mTorr (10⁻³ torr) at every process step. Numerically the torr is almost identical to the mmHg (1 torr ≈ 1.000000 mmHg under modern definitions; historically they differed by 0.000015%).
Quick Facts
- 1 Atmosphere equals 760.002 Torr
- 1 Torr equals 0.00131579 Atmospheres
- Atmosphere is a unit of pressure
- Torr is a unit of pressure
- This conversion is commonly used in tire inflation, weather reporting, scuba diving, and engineering
Common Atmosphere to Torr Conversions
| Atmospheres (atm) | Torr (torr) |
|---|---|
| 0.1 | 76.0002 |
| 0.5 | 380.001 |
| 1 | 760.002 |
| 2 | 1520 |
| 5 | 3800.01 |
| 10 | 7600.02 |
| 14.696 | 11169 |
| 15 | 11400 |
| 20 | 15200 |
| 25 | 19000.1 |
| 50 | 38000.1 |
| 100 | 76000.2 |
| 150 | 114000 |
| 200 | 152000 |
| 500 | 380001 |
| 1000 | 760002 |
Understanding Atmospheres
The Atmosphere (symbol: atm) is a unit of pressure. A non-SI unit of pressure defined as exactly 101,325 pascals, corresponding to the standard sea-level atmospheric pressure as adopted by ISO 2533 and the BIPM SI Brochure. Atmospheres are the default reference pressure in physical chemistry (Standard Temperature and Pressure conventions: 1 atm at 273.15 K under IUPAC's 'STP' definition, though IUPAC has since moved to 1 bar STP), in commercial diving (depths are quoted in atmospheres absolute, with each 10 m of seawater adding ~1 atm), and in pressure-sensitive materials research where vapor pressure and saturation data are tabulated at 1 atm. A common pitfall: the "technical atmosphere" (at, 98,066.5 Pa = 1 kgf/cm²) used in some legacy European and Japanese engineering is NOT the same as the standard atmosphere — older pressure-vessel drawings can read 100 at and mean either depending on context. 1 atm = 1.01325 bar = 14.696 psi = 760 mmHg = 760 torr.
Atmospheres are commonly used in tire inflation, weather reporting, scuba diving, and engineering.
Understanding Torr
The Torr (symbol: torr) is a unit of pressure. A unit of pressure defined as exactly 1/760 of a standard atmosphere (≈ 133.322 Pa). Named after 17th-century physicist Evangelista Torricelli, who in 1643 invented the mercury barometer while studying why suction-lift pumps fail above ~10 m — establishing that the atmosphere itself has weight. The torr is the primary unit in modern vacuum technology and semiconductor fabrication: a "rough vacuum" is ~1 torr, "medium vacuum" 10⁻³ torr (typical of mechanical-pump-only systems), "high vacuum" 10⁻⁶ torr (achievable with turbomolecular pumps, used in mass spectrometry and electron microscopy), and "ultrahigh vacuum" (UHV) 10⁻⁹ torr or lower (semiconductor MBE, surface science, particle accelerators). Manufacturing fabs quote chamber pressures in torr or mTorr (10⁻³ torr) at every process step. Numerically the torr is almost identical to the mmHg (1 torr ≈ 1.000000 mmHg under modern definitions; historically they differed by 0.000015%).
Torr are commonly used in tire inflation, weather reporting, scuba diving, and engineering.
Why Convert Atmospheres to Torr?
Engineers, mechanics, and scientists frequently need to convert pressure between Atmospheres and Torr when working with different measurement standards. Tire pressure, blood pressure readings, weather barometric measurements, and industrial process specifications may all use different pressure units depending on the region or discipline. Reliable conversion prevents equipment misuse and ensures safety.
Frequently Asked Questions
How do I convert Atmospheres to Torr?
A non-SI unit of pressure defined as exactly 101,325 pascals, corresponding to the standard sea-level atmospheric pressure as adopted by ISO 2533 and the BIPM SI Brochure. To convert Atmospheres to Torr, multiply by 760.002. For example, 25 atm equals 19000.1 torr.
How many Torr are in 1 Atmosphere?
There are 760.002 Torr in 1 Atmosphere.
How many Atmospheres are in 1 Torr?
There are 0.00131579 Atmospheres in 1 Torr.
What is the formula for Atmosphere to Torr conversion?
The formula is: multiply by 760.002. This means 1 atm = 760.002 torr.
Is a Atmosphere bigger than a Torr?
No. One Atmosphere is smaller than one Torr because 1 atm equals 760.002 torr, which is greater than 1.
When do you need to convert between Atmospheres and Torr?
A unit of pressure defined as exactly 1/760 of a standard atmosphere (≈ 133. Atmosphere and Torr are both pressure units, so conversion comes up whenever one source of information uses one unit and another uses the other — a classic cross-reference challenge in engineering, trade, travel, and everyday life.