Planck constant

The Planck constant ($h$), is named after the German physicist Max Karl Ernst Ludwig Planck. Its value (in SI units, 2006 CODATA) is:

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More recent measurements place a preliminary value at $6.62607095(44)\times 10^{-34}$ Js (Ref. 1)

References

1. I A Robinson and B P Kibble "An initial measurement of Planck's constant using the NPL Mark II watt balance", Metrologia 44 pp. 427-440 (2007)