why the concept of mass is change in 2019
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Humanity has a new definition of the kilogram, the standard unit of mass used the world over.
The change — implemented on this World Metrology Day — will occur more silently than when a leap second was added to a year. It will disrupt nothing. The number on your bathroom scale isn’t going to change, for better or worse.
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They are beautiful, with mirror finishes, and I have to resist the urge to touch them. If I did touch them, I could contaminate them with oil from my skin and potentially increase their weight. Patrick Abbott, the “keeper of the kilogram” here at the National Institutes of Standards and Technology (NIST), tells me this would be very bad.
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