Convert Pascals to Atmospheres
Instantly convert Pascals (Pa) to Atmospheres (atm) with our free online calculator.
Formula: Pa to atm — multiply by 9.8692e-6
Reference Table
| Pascals (Pa) | Atmospheres (atm) |
|---|---|
| 1 | 0.00000986923 |
| 5 | 0.0000493462 |
| 10 | 0.0000986923 |
| 25 | 0.000246731 |
| 50 | 0.000493462 |
| 100 | 0.000986923 |
How to Convert Pascals to Atmospheres
Formula
To convert Pascals (Pa) to Atmospheres (atm): multiply by 9.8692e-6
Step-by-Step
- Start with your value in Pascals (Pa).
- Multiply by 9.8692e-6 to perform the conversion.
- The result is your value expressed in Atmospheres (atm).
Conversion Factor
1 Pa = 0.00000986923 atm
Reverse Factor
1 atm = 101325 Pa
Worked Example
Convert 25 Pascals to Atmospheres: 25 Pa = 0.000246731 atm
About Pascal (Pa)
The SI derived unit of pressure (and stress), formally defined as one newton per square meter (N/m²) by ISO 80000-4. Named for 17th-century French mathematician Blaise Pascal, whose 1647-48 Puy-de-Dôme experiment established that atmospheric pressure decreases with altitude. The pascal is a small unit — standard sea-level atmospheric pressure is exactly 101,325 Pa per the BIPM SI Brochure — so working engineering and meteorology use multiples: kilopascals (kPa) for everyday gauge pressures, megapascals (MPa) for material strength, hectopascals (hPa) for barometric readings (1 kPa = 10 hPa). The pascal is the universal SI reference for pressure across scientific publication (Physical Review, J. Fluid Mechanics), thermodynamic state tables (NIST REFPROP), and international engineering codes (ASME, EN, JIS). Converting Pa to psi is a divide-by-6894.76; Pa to bar is divide-by-100,000.
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.
Quick Facts
- 1 Pascal equals 0.00000986923 Atmospheres
- 1 Atmosphere equals 101325 Pascals
- Pascal is a unit of pressure
- Atmosphere is a unit of pressure
- This conversion is commonly used in tire inflation, weather reporting, scuba diving, and engineering
- The Pascal belongs to the metric system
Common Pascal to Atmosphere Conversions
| Pascals (Pa) | Atmospheres (atm) |
|---|---|
| 0.1 | 9.869233e-7 |
| 0.5 | 0.00000493462 |
| 1 | 0.00000986923 |
| 2 | 0.0000197385 |
| 5 | 0.0000493462 |
| 10 | 0.0000986923 |
| 14.696 | 0.000145038 |
| 15 | 0.000148038 |
| 20 | 0.000197385 |
| 25 | 0.000246731 |
| 50 | 0.000493462 |
| 100 | 0.000986923 |
| 150 | 0.00148038 |
| 200 | 0.00197385 |
| 500 | 0.00493462 |
| 1000 | 0.00986923 |
Understanding Pascals
The Pascal (symbol: Pa) is a unit of pressure. The SI derived unit of pressure (and stress), formally defined as one newton per square meter (N/m²) by ISO 80000-4. Named for 17th-century French mathematician Blaise Pascal, whose 1647-48 Puy-de-Dôme experiment established that atmospheric pressure decreases with altitude. The pascal is a small unit — standard sea-level atmospheric pressure is exactly 101,325 Pa per the BIPM SI Brochure — so working engineering and meteorology use multiples: kilopascals (kPa) for everyday gauge pressures, megapascals (MPa) for material strength, hectopascals (hPa) for barometric readings (1 kPa = 10 hPa). The pascal is the universal SI reference for pressure across scientific publication (Physical Review, J. Fluid Mechanics), thermodynamic state tables (NIST REFPROP), and international engineering codes (ASME, EN, JIS). Converting Pa to psi is a divide-by-6894.76; Pa to bar is divide-by-100,000.
It belongs to the metric measurement system.
Pascals are commonly used in tire inflation, weather reporting, scuba diving, and engineering.
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.
Why Convert Pascals to Atmospheres?
Engineers, mechanics, and scientists frequently need to convert pressure between Pascals and Atmospheres 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 Pascals to Atmospheres?
The SI derived unit of pressure (and stress), formally defined as one newton per square meter (N/m²) by ISO 80000-4. To convert Pascals to Atmospheres, multiply by 9.8692e-6. For example, 25 Pa equals 0.000246731 atm.
How many Atmospheres are in 1 Pascal?
There are 0.00000986923 Atmospheres in 1 Pascal.
How many Pascals are in 1 Atmosphere?
There are 101325 Pascals in 1 Atmosphere.
What is the formula for Pascal to Atmosphere conversion?
The formula is: multiply by 9.8692e-6. This means 1 Pa = 0.00000986923 atm.
Is a Pascal bigger than a Atmosphere?
Yes. One Pascal is larger than one Atmosphere because 1 Pa equals 0.00000986923 atm, which is less than 1.
When do you need to convert between Pascals and Atmospheres?
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. Pascal and Atmosphere 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.