In The News Posted February 5, 2019 Share Posted February 5, 2019 PALO ALTO, Calif., Feb. 5, 2019 /PRNewswire/ -- In 1799 the kilogram was defined as the mass of a litre of water. In 1889, metal cylinders of the precise identical mass were created as reference objects. In the hundreds of years since, the physical nature of the metal caused those... View the full article Link to comment Share on other sites More sharing options...
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