The 'new' kilogram is approaching: Avogadro constant determined with enriched silicon-28

A milestone in the international Avogadro project coordinated by the Physikalisch-Technische Bundesanstalt (PTB) has been reached: With the aid of a single crystal of highly enriched 28Si, the Avogadro constant has now been measured as exactly as never before with a relative overall uncertainty of 3 • 10-8. Within the scope of the redefinition of the kilogram, the value NA = 6.02214078(18) • 1023 mol-1 permits the currently most exact realization of this unit. The results have been published in the most recent edition of the journal Physical Review Letters.

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