Fundamental Physical Constants from NIST

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published by the National Institute of Standards and Technology
written by Peter Mohr and Barry Taylor

Values of the fundamental physical constants, recommended for international use, are provided at this web site developed and maintained by the National Institute of Standards and Technology (NIST). These are the latest values of the constants recommended by CODATA (updated in 2006). Included are values for universal, electromagnetic, and atomic/nuclear constants, as well as non-SI units and conversion factors for energy equivalents. Users may also view background information related to constants, a searchable bibliography, and correlation coefficients between any pair of constants.

https://physics.nist.gov/cuu/Constants/index.html

Subjects	Levels	Resource Types
General Physics - Measurement/Units	- High School - Lower Undergraduate - Upper Undergraduate - Informal Education - Graduate/Professional	- Reference Material - Dataset

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Formats:: text/html
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Access Rights:: Free access
Restriction:: © 1994 NIST
Keywords:: constants, physical constants, standards
Record Creator:: Date Metadata Instance was created April 22, 2003 by Waylon Flinn
Record Updated:: February 6, 2013 by Lyle Barbato
Last Update when Cataloged:: November 1, 2012
Other Collections:: The PSRC

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AAAS Benchmark Alignments (2008 Version)

12. Habits of Mind

12B. Computation and Estimation

9-12: 12B/H1. Use appropriate ratios and proportions, including constant rates, when needed to make calculations for solving real-world problems.

This resource is part of a Physics Front Topical Unit.

Topic: Measurement and the Language of Physics
Unit Title: Applying Measurement in Physics

Values of the fundamental physical constants, recommended for international use, are provided at this web site. These are the latest values of the constants recommended by CODATA. Need background information? It's all there, in an easily-searchable format. Note: CODATA adjustment based on the recently revised SI is under review in 2018. By 12/31/2018, changes will be made that will significantly affect the uncertainties of many constants.

Link to Unit:

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Record Link

<a href="https://www.compadre.org/precollege/items/detail.cfm?ID=91">Mohr, Peter, and Barry Taylor. Fundamental Physical Constants from NIST. Gaithersburg: National Institute of Standards and Technology, November 1, 2012.</a>

AIP Format

P. Mohr and B. Taylor, (National Institute of Standards and Technology, Gaithersburg, 1994), WWW Document, (https://physics.nist.gov/cuu/Constants/index.html).

AJP/PRST-PER

P. Mohr and B. Taylor, Fundamental Physical Constants from NIST (National Institute of Standards and Technology, Gaithersburg, 1994), <https://physics.nist.gov/cuu/Constants/index.html>.

APA Format

Mohr, P., & Taylor, B. (2012, November 1). Fundamental Physical Constants from NIST. Retrieved April 24, 2025, from National Institute of Standards and Technology: https://physics.nist.gov/cuu/Constants/index.html

Chicago Format

Mohr, Peter, and Barry Taylor. Fundamental Physical Constants from NIST. Gaithersburg: National Institute of Standards and Technology, November 1, 2012. https://physics.nist.gov/cuu/Constants/index.html (accessed 24 April 2025).

MLA Format

Mohr, Peter, and Barry Taylor. Fundamental Physical Constants from NIST. Gaithersburg: National Institute of Standards and Technology, 1994. 1 Nov. 2012. 24 Apr. 2025 <https://physics.nist.gov/cuu/Constants/index.html>.

BibTeX Export Format

@misc{ Author = "Peter Mohr and Barry Taylor", Title = {Fundamental Physical Constants from NIST}, Publisher = {National Institute of Standards and Technology}, Volume = {2025}, Number = {24 April 2025}, Month = {November 1, 2012}, Year = {1994} }

Refer Export Format

%A Peter Mohr %A Barry Taylor %T Fundamental Physical Constants from NIST %D November 1, 2012 %I National Institute of Standards and Technology %C Gaithersburg %U https://physics.nist.gov/cuu/Constants/index.html %O text/html

EndNote Export Format

%0 Electronic Source %A Mohr, Peter %A Taylor, Barry %D November 1, 2012 %T Fundamental Physical Constants from NIST %I National Institute of Standards and Technology %V 2025 %N 24 April 2025 %8 November 1, 2012 %9 text/html %U https://physics.nist.gov/cuu/Constants/index.html

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The AIP Style presented is based on information from the AIP Style Manual.

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Fundamental Physical Constants from NIST:

Is Associated With The NIST Reference: International System of Units (SI)

This web page provides essential information about the International System of Units (SI), including links to online unit converters, background information on the base units, and a section on non-SI units. (Also developed and maintained by NIST.)

relation by Caroline Hall

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