PSI to Pièzes (psi to pz)
1 pound per square inch equals 6.894757293 pièzes (rounded).
How to convert pounds per square inch to pièzes
To convert pounds per square inch to pièzes, multiply the number of pounds per square inch by 6.894757293. The factor is rounded to 10 significant digits. To go the other way, multiply pièzes by 0.1450377377 (rounded).
pièzes = pounds per square inch × 6.894757293
Example: 10 pounds per square inch = 68.94757293 pièzes.
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)
Pièze (pz)
Exactly 1,000 pascals (1 kPa): the pressure unit of the old French meter-tonne-second (MTS) system.
French metrologists coined the pièze, symbol pz, for pressure in the metre-tonne-second (MTS) system, which was France's legal system from 1919 to 1961. The Soviet Union adopted the same system in 1933 and abolished it in 1955. The name is French, and Wikipedia does not explain its origin further.
The MTS system used large units suited to industry rather than laboratories, and the pièze follows that pattern. It is defined as one sthène of force per square metre, which works out to exactly 1,000 pascals, or one kilopascal. That is the same as 10 millibars or one centibar, about 7.5 torr, and roughly 0.145 pounds per square inch.
Compared with everyday pressures, one pièze is about one hundredth of standard atmospheric pressure, so steam boilers and hydraulic machinery of the period would be quoted in tens or hundreds of pièzes. The unit disappeared with the MTS system, and the kilopascal now fills the same role.
1 pièze = 1,000 pascals (exactly).
Sources: Wikipedia: Pièze; Wikipedia: Metre-tonne-second system of units
Related conversions
- Pièzes 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 pièzes
- Kilopascals to pièzes
- Bars to pièzes
- Standard atmospheres to pièzes
See all pressure units.