Convert Standard Atmospheres to Megapascals
Convert Standard Atmospheres (atm) to Megapascals (MPa) instantly and accurately.
Conversion Formula
MPa = atm × 0.101325
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 Megapascals
A megapascal (MPa) = 10⁶ Pa = 10 bar - standard unit for mechanical stress, material strength, and high-pressure engineering. Structural material yield strengths: mild steel 250-550 MPa; high-strength steel to 2,000 MPa; carbon fibre composites 1,500-7,000 MPa tensile. Hydraulic press pressures 50-200 MPa. Mariana Trench floor ~110 MPa. Concrete compressive strength: 25-40 MPa (normal); up to 150 MPa (high-performance). Water-jet cutting: 200-600 MPa. Elastic moduli in FEM analysis are in MPa or GPa. 1 MPa = 10⁶ Pa = 145.0 psi.
Quick Reference Table
| Standard Atmospheres (atm) | Megapascals (MPa) |
|---|---|
| 1 atm | 0.101325 MPa |
| 2 atm | 0.20265 MPa |
| 5 atm | 0.506625 MPa |
| 10 atm | 1.01325 MPa |
| 25 atm | 2.53313 MPa |
| 50 atm | 5.06625 MPa |
| 100 atm | 10.1325 MPa |