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.

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.

<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>

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

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>.

Mohr, P., & Taylor, B. (2012, November 1). Fundamental Physical Constants from NIST. Retrieved June 7, 2023, from National Institute of Standards and Technology: https://physics.nist.gov/cuu/Constants/index.html

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 7 June 2023).

Mohr, Peter, and Barry Taylor. Fundamental Physical Constants from NIST. Gaithersburg: National Institute of Standards and Technology, 1994. 1 Nov. 2012. 7 June 2023 <https://physics.nist.gov/cuu/Constants/index.html>.

@misc{
Author = "Peter Mohr and Barry Taylor",
Title = {Fundamental Physical Constants from NIST},
Publisher = {National Institute of Standards and Technology},
Volume = {2023},
Number = {7 June 2023},
Month = {November 1, 2012},
Year = {1994}
}

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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.)