Convert Nanopascals to Standard Atmospheres
Convert Nanopascals (nPa) to Standard Atmospheres (atm) instantly and accurately.
Conversion Formula
atm = nPa × 9.869232667e-15
About Nanopascals
A nanopascal (nPa) is 10⁻⁹ Pa - the pressure scale of deep interplanetary space. LIGO and Virgo gravitational wave detectors must isolate mirror displacement signals against noise floors in the nanopascal regime. Low Earth orbit residual atmosphere is ~100 µPa; deep interplanetary space is ~1-10 nPa depending on solar wind activity. Thermospheric gas layers above 200 km altitude fall into the nPa-µPa range. Casimir force calculations and quantum vacuum fluctuation modelling also operate at nanopascal scales. 1 nPa = 10⁻⁹ Pa.
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
| Nanopascals (nPa) | Standard Atmospheres (atm) |
|---|---|
| 1 nPa | 9.869 × 10-15 atm |
| 2 nPa | 1.974 × 10-14 atm |
| 5 nPa | 4.935 × 10-14 atm |
| 10 nPa | 9.869 × 10-14 atm |
| 25 nPa | 2.467 × 10-13 atm |
| 50 nPa | 4.935 × 10-13 atm |
| 100 nPa | 9.869 × 10-13 atm |