High-purity Silicon Sphere (IMAGE)

Physikalisch-Technische Bundesanstalt (PTB)

High-purity Silicon Sphere

Caption

The high-purity silicon sphere of the Avogadro experiment reflects a copy of the international kilogram prototype - the last embodiment of a unit via a physical body. The sphere, in contrast, stands for the definition on the basis of atomic properties or fundamental constants.

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PTB

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