Convert Millimeters of Mercury to Kilopounds per Square Inch
Convert Millimeters of Mercury (mmHg) to Kilopounds per Square Inch (ksi) instantly and accurately.
Conversion Formula
ksi = mmHg × 1.933677746e-5
About Millimeters of Mercury
One millimetre of mercury (mmHg) = pressure from 1 mm of mercury at 0°C and standard gravity = 133.322 Pa. Clinical medicine worldwide uses mmHg for blood pressure (normal ~120/80 mmHg) and for gas partial pressures in physiology: arterial O₂ ~95-100 mmHg; CO₂ ~40 mmHg; alveolar O₂ ~104 mmHg. Ophthalmologists measure intraocular pressure in mmHg (normal 10-21; glaucoma risk above 21). Vacuum equipment ratings are also given in mmHg. 760 mmHg = 1 atm. 1 mmHg = 133.322 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
| Millimeters of Mercury (mmHg) | Kilopounds per Square Inch (ksi) |
|---|---|
| 1 mmHg | 1.934 × 10-5 ksi |
| 2 mmHg | 3.867 × 10-5 ksi |
| 5 mmHg | 9.668 × 10-5 ksi |
| 10 mmHg | 0.000193368 ksi |
| 25 mmHg | 0.000483419 ksi |
| 50 mmHg | 0.000966839 ksi |
| 100 mmHg | 0.00193368 ksi |