These are the top 10 landmarks in the history of making measurements

Metrology’s long history is enriched by new definitions of basic units

Market scale

WEIGHING IN A new definition of the kilogram, the metric unit of mass, is the latest advance in metrology, the science of measurement. A market scale in Argentina illustrates the use of decimal subdivisions for units, established in 1799 by the adoption in France of the original metric system.

Dan Tarradellas/Getty Images

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