Scientists close to new definition of the kilogram - Technology & science
Scientists say they are close to achieving a 200-year-old goal of creating a universal system of measurements based on stable quantities, as they progress toward changing how the kilogram is defined.
The kilogram is the only base unit in the International System of Units (SI) that is still defined by a physical object — a prototype of platinum-iridium kept in the vaults of the International Bureau of Measurements (BIPM) in France.
The stability of the kilogram is crucial as it forms the basis from which many other units are derived.
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