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Old 13 November 2018, 07:16 PM
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E. Q. Taft E. Q. Taft is offline
 
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Royalty Metric system overhaul will dethrone the one, true kilogram

Like an aging monarch, Le Grand K is about to bow to modernity. For 130 years, this gleaming cylinder of platinum-iridium alloy has served as the world’s standard for mass. Kept in a bell jar and locked away at the International Bureau of Weights and Measures (BIPM) in Sèvres, France, the weight has been taken out every 40 years or so to calibrate similar weights around the world. Now, in a revolution far less bloody than the one that cost King Louis XVI his head, it will cede its throne as the one, true kilogram.

https://www.sciencemag.org/news/2018...-true-kilogram
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Old 13 November 2018, 07:46 PM
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The linked article did not mention one of the reasons to go away from the physical Le Grand K --- Le Grand K is shrinking, minutely, but now measurably shrinking as a few atoms leave over long periods of time. Thus for hyper accurate measurement needs, a definition of the unit that does not rely on a physical object that is slowly changing is necessary.

A sneeze could change what ‘kilogram’ means

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And it’s not just a joke. Compared to official replicas held by other laboratories around the globe, Le Grand K is shrinking, albeit by just .05 milligrams in mass.
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