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 https://www.sciencedaily.com/releases/2019/05/190521124637.htm
from Top Technology News -- ScienceDaily https://www.sciencedaily.com/releases/2019/05/190521124637.htm
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