Abstract
Recent determinations of the volt and the quantized Hall resistance at the Australian National Measurement Laboratory have yielded values having sub-ppm uncertainties for a number of important fundamental constants. The direct experimental results are 2e/h=483.597 90(15) THz ${\mathrm{V}}^{\mathrm{\ensuremath{-}}1}$ and h/${e}^{2}$=25 812.809 9(20) \ensuremath{\Omega}, both in SI units. Derived values are given for the electron charge, Planck's constant, the magnetic flux quantum, and the inverse fine-structure constant.
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