OFFSET
-33,1
COMMENTS
From Raphie Frank, Dec 17 2012: (Start)
There are at least five different methods of determining Planck's constant (h). Listed below are the best estimate CODATA values for each of these five methods as of December 2012.
6.6260657(88)*10^(-34) J*s - Faraday Constant method.
6.6260678(27)*10^(-34) J*s - Josephson Constant method.
6.62606889(23)*10^(-34) J*s - Watt Balance method.
6.6260724(57)*10^(-34) J*s - Magnetic resonance method.
6.6260745(19)*10^(-34) J*s - X-ray crystal density method. (End)
The latest definition is that the Planck constant h is exactly 6.62607015*10^(-34) J*s, according to the ISO standard (effective on May 20th, 2019). h is one of the seven 1990 SI units, see the second BIPM link and A322415. - Ralf Steiner, Dec 17 2018 and Wolfdieter Lang, Feb 12 2019
REFERENCES
H. J. Fischbeck and K. Fischbeck, Formulas. Facts and Constants, Springer-Verlag, NY, 2nd ed., 1987.
K. R. Lang, Astrophysical Data: Planets and Stars, Springer-Verlag, NY, 1991.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
LINKS
BIPM, On the revision of the SI, BIPM, Nov 11 2018.
BIPM, On the revision of the International System of Units (SI), BIPM, Nov 13-16 2018.
Gavin Clarke, Glorious silicon globes could hold key to elusive PERFECT kilogram, The Register, Nov 20 2012.
NIST Physics Laboratory, Planck constant
James Stein, Planck's Constant: The Number That Rules Technology, Reality, and Life, NOVA's Physics blog, Oct 24 2011.
Stanislav Sýkora, Magnetic Resonance on OEIS, Stan's NMR Blog (Dec 31, 2014), Retrieved Nov 12, 2019.
Eric Weisstein, World of Physics, Planck's Constant
Wikipedia, Planck's constant
Wikipedia, Redefinition of SI base units
EXAMPLE
Planck constant h = 6.62607015 * 10^(-34) J * s. J (Joule) = kg m^2 s^(-1).
CROSSREFS
KEYWORD
AUTHOR
EXTENSIONS
Corrected and extended by Robert G. Wilson v, Nov 21 2002
Changed the value to conform to latest measurements Robert G. Wilson v, Oct 21 2010
Updated to conform with CODATA 2010 recommended value Raphie Frank, Dec 15 2012
Updated by Omar E. Pol, Dec 11 2016
Updated by Ralf Steiner, Dec 17 2018
Update for May 20 2019 by Wolfdieter Lang, Feb 12 2019
STATUS
approved