Comment on The Definition of a Kilogram Just Changed. That’s a Major Milestone in the Grand History of the Metric System

The Definition of a Kilogram Just Changed. That’s a Major Milestone in the Grand History of the Metric System

The U.S. National Institute of Standards and Technology called this Friday a “turning point for humanity,” even though the difference between this day and the day before weighs, theoretically, nothing at all. But, while something that weighs a kilogram — the basic unit of mass — is just as heavy as it was before, the way that kilogram is defined has changed, after a vote by scientists at the General Conference on Weights and Measures in Paris. For 130 years, the kilogram has been defined as the exact weight of a cylinder of platinum-iridium held in a triple-locked vault in Paris.

 

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