Kilogram-force per square centimetre
Kilogram-force per square centimetre | |
---|---|
Soviet-made pressure gauges using kgf/cm2 | |
General information | |
Unit of | Pressure |
Symbol | kgf/cm2, at |
Conversions | |
1 kgf/cm2 in ... | ... is equal to ... |
SI units | 98.06650 kPa |
FPS units | 14.22334 psi |
A kilogram-force per square centimetre (kgf/cm2), often just kilogram per square centimetre (kg/cm2), or kilopond per square centimetre (kp/cm2) is a deprecated unit of pressure using metric units. It is not a part of the International System of Units (SI), the modern metric system. 1 kgf/cm2 equals 98.0665 kPa (kilopascals) or 0.980665 bar—2% less than a bar. It is also known as a technical atmosphere (symbol: at).[1][2]
Use of the kilogram-force per square centimetre continues primarily due to older pressure measurement devices still in use.
This use of the unit of pressure provides an intuitive understanding for how a body's mass, in contexts with roughly standard gravity, can apply force to a scale's surface area, i.e. kilogram-force per square (centi-)metre.
In SI units, the unit is converted to the SI derived unit pascal (Pa), which is defined as one newton per square metre (N/m2). A newton is equal to 1 kg⋅m/s2, and a kilogram-force is 9.80665 N,[3] meaning that 1 kgf/cm2 equals 98.0665 kilopascals (kPa).
In some older publications, kilogram-force per square centimetre is abbreviated ksc instead of kg/cm2.
Pascal | Bar | Technical atmosphere | Standard atmosphere | Torr | Pound per square inch | |
---|---|---|---|---|---|---|
(Pa) | (bar) | (at) | (atm) | (Torr) | (lbf/in2) | |
1 Pa | — | 1 Pa = 10−5 bar | 1 Pa = 1.0197×10−5 at | 1 Pa = 9.8692×10−6 atm | 1 Pa = 7.5006×10−3 Torr | 1 Pa = 0.000145037737730 lbf/in2 |
1 bar | 105 | — | = 1.0197 | = 0.98692 | = 750.06 | = 14.503773773022 |
1 at | 98066.5 | 0.980665 | — | 0.9678411053541 | 735.5592401 | 14.2233433071203 |
1 atm | ≡ 101325 | ≡ 1.01325 | 1.0332 | — | 760 | 14.6959487755142 |
1 Torr | 133.322368421 | 0.001333224 | 0.00135951 | 1/760 ≈ 0.001315789 | — | 0.019336775 |
1 lbf/in2 | 6894.757293168 | 0.068947573 | 0.070306958 | 0.068045964 | 51.714932572 | — |
1 at = 98.0665 kPa ≈ 0.96784 standard atmospheres
Ambiguity of at
The symbol "at" clashes with that of the katal (symbol: "kat"), the SI unit of catalytic activity; a kilotechnical atmosphere would have the symbol "kat", indistinguishable from the symbol for the katal. It also clashes with that of the non-SI unit, the attotonne, but that unit would more likely be rendered as the equivalent SI unit, the picogram.
References
- ^ Dorf, Richard C. (2003-11-24). CRC Handbook of Engineering Tables. CRC Press. ISBN 9780203009222.
- ^ Suplee, Curt (2009-07-02). "Special Publication 811". NIST. Retrieved 2019-05-17.
- ^ The NIST Guide for the use of the International System of Units, National Institute of Standards and Technology, 18 Oct 2011