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In section "Modern Value", fixed "with relative tandard uncertainty..." to "with relative standard uncertainty..." |
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By 1969, the value recommended by the [[National Institute of Standards and Technology]] (NIST) was cited with a relative standard uncertainty of 0.046% (460 ppm), lowered to 0.012% (120 ppm) by 1986. But the continued publication of conflicting measurements led NIST to considerably increase the standard uncertainty in the 1998 recommended value, by a factor of 12, to a standard uncertainty of 0.15%, larger than the one given by Heyl (1930).
The uncertainty was again lowered in 2002 and 2006, but once again raised, by a more conservative 20%, in 2010, matching the relative standard uncertainty of 120 ppm published in 1986.<ref>{{Cite journal|url = http://physics.nist.gov/cuu/pdf/RevModPhysCODATA2010.pdf|title = CODATA recommended values of the fundamental physical constants: 2010|date = 13 November 2012|journal = Reviews of Modern Physics |doi = 10.1103/RevModPhys.84.1527|bibcode=2012RvMP...84.1527M|arxiv = 1203.5425 |volume=84 |issue = 4|pages=1527–1605|last1 = Mohr|first1 = Peter J.|last2 = Taylor|first2 = Barry N.|last3 = Newell|first3 = David B.|s2cid = 103378639|citeseerx = 10.1.1.150.3858}}</ref> For the 2014 update, CODATA reduced the uncertainty to 46&
The following table shows the NIST recommended values published since 1969:
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