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Gravitational metric system : ウィキペディア英語版 | Gravitational metric system
In the gravitational metric system 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) but it depends on a selected or locally measured gravitational constant ''g''n. It is a non-standard unit and does not comply with SI, the International System of Units. This constant is usually set to an acceleration of 9.80665 m/s2, based on the gravitational acceleration on the surface of the Earth. Other derived units inherit this factor. Sometimes alternatively 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. ==Units==
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