kilopond

Convert between kiloponds and other major units of force.

A unit of force, 1939 – late 20th century, the Central European and Scandinavian equivalent of the kilogram-force, the force exerted by a mass of 1 kilogram at the standardized value of the acceleration due to Earth's gravity, 9.80665 meters per second per second; in other words, roughly the weight of a kilogram, 9.80665 newtons. Symbol, kp. Thus instead of a meter–kilogram-force–second system, they had a meter-kilopond-second system. The French equivalent is the kilopoid.

The kilogram had been used in the 19th and early 20th centuries both as a unit of mass and as a unit of weight, which is a force. Distinguishing between the two in favor of mass created the need for a unit of force. In 1934, for example, the Swedish Royal Mint ended the uncertainty in Sweden by declaring the kilogram to be a unit of mass.1

The word “kilopond” was used internally by the Physikalisch-Technische Reichanstalt, the official German standards laboratory, as early as 1939. In 1945 Sweden adopted the kilopond as its unit of force. The Verein Deutscher Ingenieure (Society of German Engineers, VDI), however, objected in 1950 to the term's adoption in Germany on the grounds that units ought not to be adopted on a national basis and that “pond” was too close to “pound.” The decision by Technical Committee 12 of the International Standards Organization to recommend adoption of both the kilopond and kilogram-force as synonyms (1955, 1957) removed the first of these objections, and in August 1958 the VDI recommended provisionally that “kilopond” be used for the unit of force.2

In 1971, the European Economic Community directed that use of this unit cease by 31 December 1977.3

1. Matts Bäckström.
The clear MKS system. Contra the obscure old technical unit system.
in Systems of Units. National and International Aspects.
Carl F. Kayan, editor.
Publication No. 57 of the AAAS.
Washington, D. C.: American Association for the Advancement of Science, 1959.

Page 227.

2. G. Ruppel.
Germany's approach to reconciling system usages.
in Systems of Units. National and International Aspects.
Carl F. Kayan, editor.
Publication No. 57 of the AAAS.
Washington, D. C.: American Association for the Advancement of Science, 1959.

Page 238.

3. European Economic Community, Council Directive of 18 October 1971 on the approximation of the laws of the Member States relating to units of measurement (Directive 71/354/EEC), Annex, Chapter III.

 

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