Convert Standard Atmospheres to Kilopounds per Square Inch
Convert Standard Atmospheres (atm) to Kilopounds per Square Inch (ksi) instantly and accurately.
Conversion Formula
ksi = atm × 0.01469594878
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 Kilopounds per Square Inch
One ksi (kilopound per square inch) = 1,000 psi ≈ 6.895 MPa - the standard engineering stress unit in the US. ASTM A36 structural steel: 36 ksi yield, 58-80 ksi tensile. ASTM A325 high-strength bolts: 92 ksi proof load. AISC steel construction tables, FAA/MIL-SPEC aerospace allowables, and ASME Section VIII pressure vessel design all use ksi. Fracture toughness (K_IC) for steels: 50-200 ksi·√in. Convenient because it keeps large structural stresses as manageable 3-digit numbers. 1 ksi = 6.895 MPa.
Quick Reference Table
| Standard Atmospheres (atm) | Kilopounds per Square Inch (ksi) |
|---|---|
| 1 atm | 0.0146959 ksi |
| 2 atm | 0.0293919 ksi |
| 5 atm | 0.0734797 ksi |
| 10 atm | 0.146959 ksi |
| 25 atm | 0.367399 ksi |
| 50 atm | 0.734797 ksi |
| 100 atm | 1.46959 ksi |