PSI to Technical Atmospheres (psi to at)
1 pound per square inch equals 0.07030695796 technical atmospheres (rounded).
How to convert pounds per square inch to technical atmospheres
To convert pounds per square inch to technical atmospheres, multiply the number of pounds per square inch by 0.07030695796. The factor is rounded to 10 significant digits. To go the other way, multiply technical atmospheres by 14.22334331 (rounded).
technical atmospheres = pounds per square inch × 0.07030695796
Example: 10 pounds per square inch = 0.7030695796 technical atmospheres.
About these units
Pound Per Square Inch (psi)
About 6,894.757 pascals. The common unit for tire pressure, hydraulics and gas pipelines in the US.
Unlike most pressure units, psi has no namesake: it simply spells out its own definition, one pound-force acting on one square inch, and it is based on avoirdupois units. Used mainly in the United States, it is about 6.895 kilopascals.
The letters after the unit matter. Psia is measured against a vacuum, while psig is measured against the surrounding air, so at sea level, where the atmosphere is about 14.7 psi, you add that amount to a gauge reading to get an absolute one. A bicycle tire at 65 psig is therefore at 79.7 psia, and the label psid means a difference between two pressures rather than a reference to ambient air.
Typical automobile tires are listed at about 32 psig, and road racing bicycle tires at about 120 psig. One standard atmosphere is 14.696 psi, which gives a feel for how many multiples of sea-level air those tire pressures represent.
1 pound per square inch = 6,894.757293 pascals (approximately).
Sources: Wikipedia: Pounds per square inch; Wikipedia: Standard atmosphere (unit)
Technical Atmosphere (at)
Exactly 98,066.5 pascals: one kilogram-force per square centimeter. Still seen on gauges in older equipment.
Pressure given as kilograms-force per square centimeter is the technical atmosphere, symbol at. It is fixed by arithmetic rather than by any air measurement: one kilogram-force is 9.80665 newtons and a square centimeter is one ten-thousandth of a square meter, so the unit is exactly 98,066.5 pascals, or 98.0665 kilopascals. Shop-floor shorthand includes kg/cm2, kp/cm2 and, in some older publications, ksc.
It is close to, but not the same as, other familiar pressures. It is about 0.981 bar, roughly 2 percent below a bar, and about 0.9678 of a standard atmosphere. In pounds per square inch it comes to about 14.22. The unit is deprecated and outside SI, yet it lingers because older pressure gauges and equipment, including Soviet-made instruments, are still in service with dials marked in kgf/cm2. NIST conversion tables list it with an exact factor to the pascal.
1 technical atmosphere = 98,066.5 pascals (exactly).
Sources: Wikipedia: Technical atmosphere; NIST SP 811, Appendix B.8 conversion factors; Wikipedia: Kilogram-force
Related conversions
- Technical atmospheres to PSI (reverse)
- PSI to pascals
- PSI to kilopascals
- PSI to bars
- PSI to standard atmospheres
- PSI to hectopascals
- PSI to megapascals
- PSI to millibars
- PSI to torr
- PSI to millimeters of mercury
- PSI to inches of mercury
- PSI to gigapascals
- PSI to kilopounds per square inch
- Pascals to technical atmospheres
- Kilopascals to technical atmospheres
- Bars to technical atmospheres
- Standard atmospheres to technical atmospheres
See all pressure units.