In the gravitational metric system(s) the base unit of force is not normalised to one mass unit (gram or kilogram) times one length unit (metre or centimetre) per time unit squared (second) as in the SI, but it depends on a selected or locally measured gravitational constant gn. This constant is usually set to an acceleration of 9.80665 m/s² on Earth. Other derived units inherit this factor. Sometimes alternately the base unit of mass is the one ...
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In the gravitational metric system(s) the base unit of force is not normalised to one mass unit (gram or kilogram) times one length unit (metre or centimetre) per time unit squared (second) as in the SI, but it depends on a selected or locally measured gravitational constant gn. This constant is usually set to an acceleration of 9.80665 m/s² on Earth. Other derived units inherit this factor. Sometimes alternately the base unit of mass is the one carrying the constant.
Where the difference between weight and mass is not important or not understood, gravitational units are still common despite adoption of the SI, an absolute metric system.
In English contexts the unit of force is usually formed by simply appending “force” to the unit of mass, thus gram-force (gf) or kilogram-force (kgf), which follows the tradition of pound-force (lbf). In other, international contexts the special name pond (p) or kilopond (kp) respectively is more frequent.
The hyl, metric slug (mug), or TME (German:...
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