Convert Standard Atmospheres to Pascals
Convert Standard Atmospheres (atm) to Pascals (Pa) instantly and accurately.
Conversion Formula
Pa = atm × 101325
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.
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.
Quick Reference Table
| Standard Atmospheres (atm) | Pascals (Pa) |
|---|---|
| 1 atm | 101325 Pa |
| 2 atm | 202650 Pa |
| 5 atm | 506625 Pa |
| 10 atm | 1013250 Pa |
| 25 atm | 2533130 Pa |
| 50 atm | 5066250 Pa |
| 100 atm | 10132500 Pa |