Convert Kilopounds per Square Inch to Petapascals
Convert Kilopounds per Square Inch (ksi) to Petapascals (PPa) instantly and accurately.
Conversion Formula
PPa = ksi × 6.894757293e-9
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.
About Petapascals
A petapascal (PPa) = 10¹⁵ Pa - pressures found in stellar interiors. The Sun's centre is ~25 PPa, sustained by radiation pressure from nuclear fusion balanced against gravity. White dwarf stars: ~10⁴ PPa (electron degeneracy). Neutron stars: ~10⁹-10¹⁰ PPa, where nuclear structure fails and neutrons drip from nuclei at ~4 × 10⁸ PPa (the neutron drip line). The hadron-quark phase transition in the densest neutron star cores is estimated at 10¹⁰-10¹² PPa. No laboratory experiment can approach petapascal pressures. 1 PPa = 10¹⁵ Pa.
Quick Reference Table
| Kilopounds per Square Inch (ksi) | Petapascals (PPa) |
|---|---|
| 1 ksi | 6.895 × 10-9 PPa |
| 2 ksi | 1.379 × 10-8 PPa |
| 5 ksi | 3.447 × 10-8 PPa |
| 10 ksi | 6.895 × 10-8 PPa |
| 25 ksi | 1.724 × 10-7 PPa |
| 50 ksi | 3.447 × 10-7 PPa |
| 100 ksi | 6.895 × 10-7 PPa |