Reference on Constants, Units and Uncertainty R package constants version 2022.0 CRAN Task View: ChemPhys (https://CRAN.R-project.org/view=ChemPhys) CODATA internationally recommended values of the fundamental physical constants, provided as symbols for direct use within the R language. Optionally, the values with uncertainties and/or units are also provided if the 'errors', 'units' and/or 'quantities' packages are installed. The Committee on Data for Science and Technology (CODATA) is an interdisciplinary committee of the International Council for Science which periodically provides the internationally accepted set of values of the fundamental physical constants. This package contains the "2022 CODATA" version, published on May 2024: Eite Tiesinga, Peter J. Mohr, David B. Newell, and Barry N. Taylor (2024) <https://physics.nist.gov/cuu/Constants/>. Software Depends: R (>= 3.5.0) Suggests: errors (>= 0.3.6), units, quantities, testthat Iñaki Ucar <iucar@fedoraproject.org> Comprehensive R Archive Network (CRAN) Iñaki Ucar [aut, cph, cre] (ORCID: <https://orcid.org/0000-0001-6403-5550>) MIT + file LICENSE (https://CRAN.R-project.org/package=constants/LICENSE) 2025-09-28 application/tgz https://CRAN.R-project.org/package=constants doi:10.32614/CRAN.package.constants