A kilogram-force per centimetre square (kgf/cm²), often just kilogram per square centimetre (kg/cm²), or kilopond per centimetre square is a deprecated unit of

pressure Pressure (symbol: ''p'' or ''P'') is the force applied perpendicular to the surface of an object per unit area over which that force is distributed. Gauge pressure (also spelled ''gage'' pressure)The preferred spelling varies by country and e ...

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). It is also known as a technical atmosphere (symbol: at). The kilogram-force per square centimetre remains active as a measurement of force 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'' 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 The kilogram-force (kgf or kgF), or kilopond (kp, from la, pondus, lit=weight), is a non-standard gravitational metric unit of force. It does not comply with the International System of Units (SI) and is deprecated for most uses. The kilogram- ...

is 9.80665 N,The NIST Guide for the use of the International System of Units
''National Institute of Standards and Technology'', 18 Oct 2011 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. :

Ambiguity of at

The symbol "at" clashes with that of the

katal The katal (symbol: kat) is the unit of catalytic activity in the International System of Units (SI) used for quantifying the catalytic activity of enzymes (that is, measuring the enzymatic activity level in enzyme catalysis) and other catalyst ...

(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 To help compare different orders of magnitude, the following lists describe various mass levels between 10−59 kg and 1052 kg. The least massive thing listed here is a graviton, and the most massive thing is the observable universe. ...

References

{{DEFAULTSORT:Kilogram-Force Per Square Centimetre Units of pressure Non-SI metric units