The constants package provides the CODATA internationally recommended values of the fundamental physical constants, provided as symbols for direct use within the R language. Optionally, the values with errors and/or the values with units are also provided if the ‘errors’ and/or the ‘units’ 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 “2014 CODATA” version, published on 25 June 2015: Mohr, P. J., Newell, D. B. and Taylor, B. N. (2016), DOI: 10.1103/RevModPhys.88.035009, 10.1063/1.4954402.
Install the release version from CRAN:
install.packages("constants")The installation from GitHub requires the remotes package.
# install.packages("remotes")
remotes::install_github("r-quantities/constants")library(constants)
# use the constants in a local environment
with(syms, c0)
#> [1] 299792458
# explore which constants are available
lookup("planck constant", ignore.case=TRUE)
#> quantity symbol value unit
#> 7 Planck constant h 6.626070040e-34 J s
#> 8 Planck constant h_eV 4.135667662e-15 eV s
#> 9 Planck constant hbar h/(2*pi) J s
#> 10 Planck constant hbar_eV h_eV/(2*pi) eV s
#> 11 Planck constant hbar.c0 197.3269788 MeV fm
#> 212 molar Planck constant Na.h 3.9903127110e-10 J s mol-1
#> 213 molar Planck constant Na.h.c0 0.119626565582 J m mol-1
#> rel_uncertainty type
#> 7 1.2e-08 universal
#> 8 6.1e-09 universal
#> 9 1.2e-08 universal
#> 10 6.1e-09 universal
#> 11 6.1e-09 universal
#> 212 4.5e-10 physicochemical
#> 213 4.5e-10 physicochemical
# attach the symbols to the search path and use them explicitly
attach(syms)
#> The following object is masked from package:base:
#>
#> F
hbar
#> [1] 1.054572e-34
# use constants with errors
detach(syms); attach(syms_with_errors)
#> The following object is masked from package:base:
#>
#> F
hbar
#> 1.05457180(1)e-34
# use constants with units
detach(syms_with_errors); attach(syms_with_units)
#> The following object is masked from package:base:
#>
#> F
hbar
#> 1.054572e-34 J*s
# the whole dataset
head(codata)
#> quantity symbol value unit
#> 1 speed of light in vacuum c0 299792458 m s-1
#> 2 magnetic constant mu0 4*pi*1e-7 N A-2
#> 3 electric constant epsilon0 1/(mu0*c0^2) F m-1
#> 4 characteristic impedance of vacuum Z0 mu0*c0 Ω
#> 5 Newtonian constant of gravitation G 6.67408e-11 m3 kg-1 s-2
#> 6 Newtonian constant of gravitation G_hbar.c0 6.70861e-39 GeV-2 c4
#> rel_uncertainty type
#> 1 0.0e+00 universal
#> 2 0.0e+00 universal
#> 3 0.0e+00 universal
#> 4 0.0e+00 universal
#> 5 4.7e-05 universal
#> 6 4.7e-05 universal
# number of constants per type
dplyr::count(codata, type, sort=TRUE)
#> # A tibble: 15 x 2
#> type n
#> <chr> <int>
#> 1 atomic-nuclear-electron 31
#> 2 atomic-nuclear-proton 26
#> 3 atomic-nuclear-neutron 24
#> 4 physicochemical 24
#> 5 atomic-nuclear-helion 18
#> 6 atomic-nuclear-muon 17
#> 7 electromagnetic 17
#> 8 universal 16
#> 9 atomic-nuclear-deuteron 15
#> 10 atomic-nuclear-general 11
#> 11 atomic-nuclear-tau 11
#> 12 atomic-nuclear-triton 11
#> 13 adopted 7
#> 14 atomic-nuclear-alpha 7
#> 15 atomic-nuclear-electroweak 2