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A measurement of the Planck constant


The advent of the Josephson effects and the more recently discovered quantized Hall resistance1 has led to rapid progress in the measurement of certain combinations of the fundamental constants, so much so that the realization of the electrical units has increasingly limited our knowledge of the value of many of the fundamental physical constants (E. R. Cohen and B. N. Taylor2). We deduce a value for the Planck constant of 6.626 0688(37)×10−34 Js from the results of the National Physical Laboratory (NPL) quantum Hall and Josephson effect measurements, and the NPL moving coil realization of the electric watt. This value is comparable with the 1986 set of values recommended by CODATA, and so confirms our understanding of the physics of condensed matter and atomic spectroscopy. Its accuracy is capable of further improvement.

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Petley, B., Kibble, B. & Hartland, A. A measurement of the Planck constant. Nature 327, 605–606 (1987).

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