Planck constant

The Planck constant (Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle h} ), is named after the German physicist Max Karl Ernst Ludwig Planck. Its value (in SI units, 2006 CODATA) is:

Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle 6.626 068 96(33)\times 10^{-34}} Js

More recent measurements place a preliminary value at Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle 6.626 070 95(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)