Convert Pascals to Standard Atmospheres
Convert Pascals (Pa) to Standard Atmospheres (atm) instantly and accurately.
Conversion Formula
atm = Pa × 9.869232667e-6
About Pascals
The pascal (Pa) is the SI unit of pressure - 1 N/m², named after Blaise Pascal (1623-1662). Standard sea-level atmosphere ≈ 101,325 Pa. One pascal is very small: roughly the pressure of a single banknote lying flat. Pascal is simultaneously the SI unit for mechanical stress and elastic modulus: structural steel Young's modulus ~200 GPa; rubber shear modulus ~0.5 MPa. Used universally in fluid mechanics, acoustics, atmospheric science, and materials engineering. 1 Pa = 1 N/m².
About Standard Atmospheres
The standard atmosphere (atm) = exactly 101,325 Pa - defined by the 10th CGPM (1954) as the reference air pressure at sea level. Used to define STP (0°C and 1 atm) for gas law and thermochemistry. Chemical equilibrium constants (Kp), Henry's law solubility, and thermodynamic tables are tabulated at 1 atm. ISA aviation standard: sea-level 1 atm / 15°C, pressure halving every ~5.5 km. Diving physics: +1 atm per 10 m depth (fresh water) so 30 m = 4 atm absolute. Diamond formation in Earth's mantle: ~50,000 atm. 1 atm = 101,325 Pa.
Quick Reference Table
| Pascals (Pa) | Standard Atmospheres (atm) |
|---|---|
| 1 Pa | 9.869 × 10-6 atm |
| 2 Pa | 1.974 × 10-5 atm |
| 5 Pa | 4.935 × 10-5 atm |
| 10 Pa | 9.869 × 10-5 atm |
| 25 Pa | 0.000246731 atm |
| 50 Pa | 0.000493462 atm |
| 100 Pa | 0.000986923 atm |