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The measurement of the Avogadro constant opened the way to a comparison ofthe watt-balance measurements of the Planck constant with the values calculatedfrom the quotients of the Planck constant and the mass of a particle or anatom. Since the energy scales of these measurements span nine energy decades,these data provide insight into the consistency of our understanding ofphysics.

Does the measured value of the Planck constant depend on the energy of measurements?