Uncertainty considerations on the new Avogadro sphere interferometer

Abstract

For the aim of redefining the SI unit kilogram basing on the Avogadro constant NA the International Avogadro Coordination has to achieve an overall relative measurement uncertainty less than 2×10-8. The most contributing part with 1×10-8 to this originates from the interferometric volume determination of the Si28 spheres. And here the dominant uncertainty… (More)

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