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The kilogram/liter was a hollow gold-plated brass sphere having a mass of approximately 1 kg and a volume of approximately 1 cubic decimeter (1 liter). ca. 1905  NIST Museum Collection

The kilogram/liter was a hollow gold-plated brass sphere having a mass of approximately 1 kg and a volume of approximately 1 cubic decimeter (1 liter). It was thus an object having the properties of a liter of pure water free from air. This was the first concept for the definition of the metric standard of mass.
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