Silicon Sphere (IMAGE)

Physikalisch-Technische Bundesanstalt (PTB)

Silicon Sphere

Caption

Using nearly perfect monocrystalline silicon spheres, the Avogadro experiment allowed not one, but two constants to be determined: the Avogadro constant and Planck's constant. After laying down the constants, such silicon spheres represent one possibility of realizing the kilogram.

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PTB

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