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Original kilogram replaced -- new International System of Units (SI) entered into force

May 21, 2019

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In addition to other scientific units, the kilogram also is now defined by a natural constant. This is made possible by single crystals grown from highly enriched silicon-28.

from Top Technology News -- ScienceDaily http://bit.ly/2ElMHVO

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Original kilogram replaced -- new International System of Units (SI) entered into force

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