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Kilogram-force per square centimetre

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(Redirected from Kilogram-force per square centimeter) Unit of pressure
Kilogram-force per square centimetre
Soviet-made pressure gauges using kgf/cm
General information
Unit ofPressure
Symbolkgf/cm, at
Conversions
1 kgf/cm in ...... is equal to ...
   SI units   98.06650 kPa
   FPS units   14.22334 psi

A kilogram-force per square centimetre (kgf/cm), often just kilogram per square centimetre (kg/cm), or kilopond per square centimetre (kp/cm) 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/cm equals 98.0665 kPa (kilopascals) or 0.980665 bar—2% less than a bar. It is also known as a technical atmosphere (symbol: at).

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/m). A newton is equal to 1 kg⋅m/s, and a kilogram-force is 9.80665 N, meaning that 1 kgf/cm equals 98.0665 kilopascals (kPa).

In some older publications, kilogram-force per square centimetre is abbreviated ksc instead of kg/cm.

Pressure units
Pascal Bar Technical atmosphere Standard atmosphere Torr Pound per square inch
(Pa) (bar) (at) (atm) (Torr) (lbf/in)
1 Pa — 1 Pa = 10 bar 1 Pa = 1.0197×10 at 1 Pa = 9.8692×10 atm 1 Pa = 7.5006×10 Torr 1 Pa = 0.000145037737730 lbf/in
1 bar 10 — = 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/in 6894.757293168 0.068947573 0.070306958 0.068045964 51.714932572 —
1 at  = 98.0665 kPa
≈ 0.96784 standard atmospheres
Pressure gauge from unknown source produced by ISGUS GmbH.Pressure gauge from unknown source. Note the visual square instead of . (Olja means "oil" in Swedish)

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

  1. Dorf, Richard C. (2003-11-24). CRC Handbook of Engineering Tables. CRC Press. ISBN 9780203009222.
  2. Suplee, Curt (2009-07-02). "Special Publication 811". NIST. Retrieved 2019-05-17.
  3. The NIST Guide for the use of the International System of Units, National Institute of Standards and Technology, 18 Oct 2011
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