Kilgewicht

Kilgewicht is a term occasionally found in Dutch- and German-language technical texts to denote the weight of a mass of one kilogram. It is not an official SI unit, and in modern metrology the base units are the kilogram for mass and the newton for force. In older or specialized literature, kilgewicht can be used to refer to the force exerted by gravity on a 1 kg mass, a concept sometimes called kilogram-force (kgf).

Definition and relation to other units: The weight W of a mass m on Earth is W = m g, where g is the local acceleration due to gravity. At standard gravity (defined as 9.80665 m/s^2), a 1 kg mass has a weight of 9.80665 newtons. This is often expressed as approximately 1 kgf, meaning one kilogram‑force. In practice, kilgewicht is thus tied to the idea of weight rather than solely to mass.

History and usage: The distinction between mass and weight has been emphasized in metrology as scientific standards progressed. Kilgewicht appears primarily in historical or calibration contexts, where weights and scales were described by their force rather than their mass. Since the redefinition of the kilogram in terms of the Planck constant, official references focus on mass in kilograms and force in newtons, with kilogram-force largely supplanted in technical usage by newtons. Nonetheless, the term kilgewicht may still be encountered in older documents, calibration records, or in casual discussions as a non‑formal way to express the weight corresponding to 1 kilogram of mass.

See also: Kilogram, Kilogram-force, Newton (unit of force), Metrology.