Convert pressure units — Pascal, bar, PSI, atm, Torr, mmHg.
| Unit | Name | Value |
|---|---|---|
| kPa | Kilopascal | 0.001 |
| bar | Bar | 0.00001 |
| atm | Atmosphere | 0.0000098692327 |
| psi | PSI | 0.00014503768 |
| Torr | Torr / mmHg | 0.0075006376 |
| inHg | Inch of Mercury | 0.00029529971 |
Formula: Atmosphere = Pascal × 9.8692e-6
Multiply any pascal value by 9.8692e-6 to get atmosphere.
Reverse: Pascal = Atmosphere × 1.013e+05
Common pascal values — factor: 1 Pa = 9.8692e-6 atm
| Pascal (Pa) | Atmosphere (atm) | Context |
|---|---|---|
| 1 Pa | 9.869e-06 atm | 1 Pa — light breeze |
| 100 Pa | 0.0009869 atm | 1 mbar |
| 1,000 Pa | 0.009869 atm | 10 mbar |
| 1e+04 Pa | 0.09869 atm | 0.1 atm |
| 101,300 Pa | 1 atm | 1 atm / sea level |
| 200,000 Pa | 1.974 atm | 2 bar |
| 500,000 Pa | 4.935 atm | 10 bar |
| 1,000,000 Pa | 9.869 atm | 10 bar |
| 10,000,000 Pa | 98.69 atm | 100 bar |
| 100,000,000 Pa | 986.9 atm | 1,000 bar |
| 6,895 Pa | 0.06805 atm | 1 psi |
| 133.3 Pa | 0.001316 atm | 1 mbar |
| 3,386 Pa | 0.03342 atm | 1 psi |
| 9.807e+04 Pa | 0.9678 atm | 1 atm / sea level |
| 1.000e+09 Pa | 9,869 atm | 10,000 bar |
Pa ÷ 101,325 = atm. Exact.
The standard atmospheric pressure in pascals.
atm × 101,325 = Pa.
Measures sound pressure levels in pascals — 20 μPa is the threshold of hearing.
Measures wind load on structures and façade pressure in pascals.
Specifies air pressure differentials across filters and dampers in Pa.
Calibrates pressure instruments traceable to SI pascal standards.
Solves Navier-Stokes equations with pressure in pascals.
Controls process chamber pressure in mPa range for deposition processes.
The pascal (Pa) is the SI derived unit of pressure, defined as one newton per square meter. It was named after Blaise Pascal, the 17th-century French mathematician and physicist who studied fluid pressure. The unit was officially adopted by the International System of Units in 1971.
Pascals are used in meteorology (atmospheric pressure ~101,325 Pa), materials science (Young's modulus in GPa), and fluid mechanics. The pascal is very small — standard atmospheric pressure equals 101,325 Pa.
Interesting fact: Blaise Pascal demonstrated in 1648 that atmospheric pressure decreases with altitude by carrying a barometer up the Puy de Dôme mountain, confirming Torricelli's theory of atmospheric pressure.
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 pascal 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 Pa = 4.9346e-5 atm and 10 Pa = 9.8692e-5 atm. For the reverse: 1 atm = 1.013e+05 Pa. The exact factor is 1 Pa = 9.8692e-6 atm.
All conversions use IEEE 754 double-precision arithmetic, accurate to at least 8 significant figures.