- Citation example:
- Eite Tiesinga, Peter J. Mohr, David B. Newell, and Barry N. Taylor (2024),
"The 2022 CODATA Recommended Values of the Fundamental Physical
Constants" (Web Version 9.0).
Database developed by J. Baker, M. Douma, and S. Kotochigova.
Available at https://physics.nist.gov/constants, National Institute of Standards and
Technology, Gaithersburg, MD 20899.
|
|
Version 9.0
9 May 2024 |
Values updated to the 2022 CODATA recommended values.
The 2022 values replace the
previously recommended 2018 CODATA
values, which are available in archived tables. |
Version 8.1
22 October 2021 |
Links to peer-reviewed published data on the 2018 adjustment of the values of the constants
was added to the site. Historical data of values of constants
in ascii format has been added for the 1998, 2002, and 2006 adjustments.
Historical data of correlation coefficients among the constants in ascii format was added
for the 1998, 2002, 2006, 2010, and 2014 adjustments.
|
Version 8.0
20 May 2019 |
Values updated to the 2018 CODATA recommended values.
The 2018 values replace the
previously recommended 2014 CODATA
values, which are available in archived tables. |
Version 7.2
5 October 2016 |
A link for the Article on the 2014 adjustment of the values of the constants
was added to the site. Links for the Wall Chart and Wallet Card of the 2014 constants were also added.
|
Version 7.1
21 January 2016 |
A link for the Summary of the 2014 values of the constants: http://arxiv.org/pdf/1507.07956
was added to the site. |
Version 7.0
25 June 2015 |
Values updated to the 2014 CODATA recommended values.
The 2014 values replace the
previously recommended 2010 CODATA
values, which are available in archived tables. |
Version 6.3
23 April 2012 |
A preprint of the paper "CODATA Recommended
Values of the Fundamental Physical Constants: 2010," by P.J. Mohr, B.N. Taylor,
and D.B. Newell, giving the details of the adjustment of the constants has been
added to the website. [1.2 MB PDF] |
Version 6.2
30 June 2011 |
The correlation coefficients were updated to the 2010 CODATA values.
|
Version 6.1
22 June 2011 |
Some of the numbers in the table of ascii values were corrected and the
relative uncertainty of the electron-helion mass ratio was added to the
relevant PDF and gif files.
|
Version 6.0
2 June 2011 |
Values updated to the 2010 CODATA recommended values.
The 2010 values replace the
previously recommended 2006 CODATA
values, which are available in archived tables. |
Version 5.2
28 June 2008 |
A reprint of the paper "CODATA Recommended Values of the Fundamental Physical Constants: 2006,"
by P.J. Mohr, B.N. Taylor, and D.B. Newell, giving the details of the
adjustment of the constants has been added to the website. It was
published in the Reviews of Modern Physics 80, 633 (2008). |
Version 5.1
31 December 2007 |
A preprint of the paper CODATA Recommended
Values of the Fundamental Physical Constants: 2006, by P.J. Mohr, B.N. Taylor,
and D.B. Newell, giving the details of the adjustment of the constants had been
added to the website. |
Version 5.0
7 March 2007 |
Values updated to the 2006 CODATA recommended values.
The 2006 values replace the
previously recommended 2002 CODATA
values, which are available in archived tables. |
Version 4.2
24 May 2005 |
Various files were updated to reflect the publication date of the
Reviews of Modern Physics article. The correlation coefficients
have been updated to give better accuracy. The file of residuals
Y has been corrected.
|
Version 4.1
18 April 2005 |
Numerical data associated with the 2002 least-squares adjustment of the
values of the constants is provided in this version with enough significant
figures to be useful in related calculations. The notation is that given in
Reviews of Modern Physics 72, 351 (2000), Appendix E. The data is
from the CODATA 2002 least-squares adjustment described in
Reviews of Modern Physics 77, 1 (2005). |
Version 4.0
9 December 2003 |
Values updated to the 2002 CODATA recommended values. A table of all
constants in ascii is available in this version. The 2002 values replace the
previously recommended 1998 CODATA
values, which are available in archived tables. |
Version 3.2
1 October 2003 |
The pages giving the conversion from hartree to joule and their correlation
coefficient were corrected to give the appropriate values of the standard and
relative standard uncertainties instead of the previously listed
"(exact)" statements. |
Version 3.1
3 December 1999 |
Various minor changes from Version 3.0 have been made, including the following.
The last digit of each of three values related to the Rydberg constant has been
changed by 1, the convention of giving values of properties of the negatively
charged muon and tau has been adopted, and the symbol for the molar mass
constant has been changed. Further details are
available. |
Version 3.0
23 July 1999 |
Values updated to the 1998 CODATA recommended values. Correlation coefficients
available between all constants. The 1998 values replace the previously
recommended 1986 CODATA values,
which are available in an archived document. |
Version 2.1
21 May 1998 |
Search algorithm improved to exclude prepositions. Links to selected scientific
data added.
NOTE:
Between July 6, 1998 and August 13, 1998, the search engine
inadvertently returned very preliminary working values intended for the next
CODATA set of recommended values. Since these were not the final values for
that update, they should be completely ignored. During that period, the
category tables provided the correct 1986 CODATA values. |
Version 2.0
17 February 1998 |
Entirely new interface, as part of the "NIST Reference on Constants, Units,
and Uncertainty." Search interface introduced. Values are available
individually in tables (from which users may copy the numbers), or by category
in both graphical and pdf formats. |
Version 1.3
1 October 1996 |
Most mathematical expressions have been converted from graphic images to html
notation for faster access. |
Version 1.2
11 September 1996 |
Postscript and Acrobat versions have been made available. |
Version 1.1
17 July 1996 |
Graphic images of the tables of constants have been improved. |
Version 1.0
6 October 1994 |
The 1986
recommended values are first made available on the internet. |
