Kilopound per Square Inch (ksi)
A unit of pressure equal to 1,000 pounds per square inch, common in structural engineering
The Kilopound per Square Inch (ksi) is a unit of pressure with a history connected to the study of fluids, gases, and atmospheric phenomena. Evangelista Torricelli's invention of the barometer in 1643 was a landmark in pressure measurement, and subsequent work by Blaise Pascal established the mathematical foundations. The pascal — the SI unit — was named in Pascal's honor when the SI system was formalized. The Kilopound per Square Inch reflects either the SI tradition or the practical conventions of specific industries that standardized their measurements independently.
Accurate pressure measurement is critical in engineering, science, commerce, and everyday life. Using the correct unit and applying conversions precisely prevents errors that can be costly or dangerous in professional applications.
Conversion Table
| Unit | Symbol | 1 ksi = |
|---|---|---|
| Pascal | Pa | 6894760 Pa |
| Kilopascal | kPa | 6894.76 kPa |
| Bar | bar | 68.9476 bar |
| Atmosphere | atm | 68.046 atm |
| Pound per Square Inch | psi | 1000 psi |
| Millimeters of Mercury | mmHg | 51715.1 mmHg |
| Megapascal | MPa | 6.89476 MPa |
| Gigapascal | GPa | 0.00689476 GPa |
| Torr | torr | 51715.1 torr |
| Inch of Mercury | inHg | 2036.02 inHg |
| Kilogram-force per Square Centimeter | kgf/cm² | 70.307 kgf/cm² |
Conversions Involving Kilopound per Square Inch
Pascal → Kilopound per Square Inch
Pa → ksi
Kilopascal → Kilopound per Square Inch
kPa → ksi
Bar → Kilopound per Square Inch
bar → ksi
Atmosphere → Kilopound per Square Inch
atm → ksi
Pound per Square Inch → Kilopound per Square Inch
psi → ksi
Millimeters of Mercury → Kilopound per Square Inch
mmHg → ksi
Megapascal → Kilopound per Square Inch
MPa → ksi
Gigapascal → Kilopound per Square Inch
GPa → ksi
Kilopound per Square Inch → Pascal
ksi → Pa
Kilopound per Square Inch → Kilopascal
ksi → kPa
Kilopound per Square Inch → Bar
ksi → bar
Kilopound per Square Inch → Atmosphere
ksi → atm
Kilopound per Square Inch → Pound per Square Inch
ksi → psi
Kilopound per Square Inch → Millimeters of Mercury
ksi → mmHg
Kilopound per Square Inch → Megapascal
ksi → MPa
Kilopound per Square Inch → Gigapascal
ksi → GPa
Kilopound per Square Inch → Torr
ksi → torr
Kilopound per Square Inch → Inch of Mercury
ksi → inHg
Kilopound per Square Inch → Kilogram-force per Square Centimeter
ksi → kgf/cm²
Torr → Kilopound per Square Inch
torr → ksi
Inch of Mercury → Kilopound per Square Inch
inHg → ksi
Kilogram-force per Square Centimeter → Kilopound per Square Inch
kgf/cm² → ksi
Common Uses of the Kilopound per Square Inch
- •Automotive — inflating tires to manufacturer-specified pressures
- •Weather reporting — tracking barometric pressure for forecasting
- •Hydraulic systems — designing and operating fluid power equipment
- •Scuba diving — calculating safe dive depths based on partial pressures
- •Medical — measuring blood pressure and calibrating medical equipment
Did You Know?
The deepest point in the ocean — the Challenger Deep in the Mariana Trench — has a water pressure of approximately 110 MPa, or about 1,086 times standard atmospheric pressure. The Kilopound per Square Inch is one of several units used to express pressures across this extraordinary range.