How many silicon atoms are there in 93.6mm diameter ball of silicon
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constant as the basis for redefinition, other constants of nature can also be used, if for no other reason than to provide a check that the Planck constant definition is correct. For decades, an international collaboration has been working on a complementary strategy for defining the kilogram that involves counting the number of atoms in an almost perfectly round, softball-sized sphere of silicon-28 atoms. The goal: a more precise determination of the Avogadro constant (NA), which relates the number of atoms or molecules in a substance to its mass.
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28 atoms
It is made out of a single crystal of silicon-28 atoms, with a roundness delta of less than 50 nano-metres over a 93.6 mm diameter.
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