Kilopounds Per Square Inch to Bars (ksi to bar)
1 kilopound per square inch equals 68.94757293 bars (rounded).
How to convert kilopounds per square inch to bars
To convert kilopounds per square inch to bars, multiply the number of kilopounds per square inch by 68.94757293. The factor is rounded to 10 significant digits. To go the other way, multiply bars by 0.01450377377 (rounded).
bars = kilopounds per square inch × 68.94757293
Example: 10 kilopounds per square inch = 689.4757293 bars.
About these units
Kilopound Per Square Inch (ksi)
1,000 psi (about 6.895 MPa). Used for the strength of materials such as steel in US engineering.
Thousands of pounds per square inch get unwieldy to write, so American engineers shortened them to ksi, the kilopound per square inch. Wikipedia notes it is used mostly in materials science, where tensile strength runs to large numbers of psi. One ksi is 1,000 psi, or about 6.895 MPa; NIST gives 6.894757 MPa.
Steel specifications, reinforced concrete and structural design are the typical uses. A concrete compressive strength of 4 ksi corresponds to about 27.6 MPa, and a bolt rated at 60 ksi would be roughly 414 MPa. The related unit Mpsi, a million psi, is used for elastic moduli of metals, so steel at 200 GPa is about 29 Mpsi. Metric countries write all of this in megapascals, which is why engineers working across borders keep the factor 6.895 close at hand.
1 kilopound per square inch = 6,894,757.293 pascals (approximately).
Sources: Wikipedia: Pounds per square inch; NIST SP 811, Appendix B.8; Wikipedia: Pascal (unit)
Bar (bar)
Exactly 100,000 pascals, close to atmospheric pressure at sea level. Used for tire pressure, diving and industrial gauges.
Bar began as a name that meant different things to different people. It comes from the Ancient Greek baros, weight, and from 1793 to 1795 an early metric system used bar for a unit of mass equal to the modern tonne. The pressure bar was introduced by the Norwegian meteorologist Vilhelm Bjerknes, a founder of modern weather forecasting, who defined it as one megadyne per square centimeter. Some earlier writers had used bar for one dyne per square centimeter, a source of confusion.
The bar is a metric unit but not part of the SI, and its official symbol is simply bar, since the old b clashes with the barn and the bit. It has been legally recognized in EU countries since 2004, although NIST deprecates it except for limited use in meteorology.
Its size is handy because 1 bar is slightly less than average sea-level pressure, which is about 1.013 bar. In scuba diving every 10 meters of seawater adds about 1 bar and a full standard tank holds about 200 bar. Tire pressure and turbocharger boost are often quoted in bar outside the US.
1 bar = 100,000 pascals (exactly).
Sources: Wikipedia: Bar (unit); Wikipedia: Atmospheric pressure
Related conversions
- Bars to kilopounds per square inch (reverse)
- Kilopounds per square inch to pascals
- Kilopounds per square inch to kilopascals
- Kilopounds per square inch to standard atmospheres
- Kilopounds per square inch to PSI
- Pascals to bars
- Kilopascals to bars
- Standard atmospheres to bars
- PSI to bars
- Hectopascals to bars
- Megapascals to bars
- Millibars to bars
- Torr to bars
- Millimeters of mercury to bars
- Inches of mercury to bars
- Gigapascals to bars
- Millimeters of water to bars
See all pressure units.