mp-units/docs/reference/systems_reference/constants_index.md

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# Constants Index

Alphabetical list of all constants.

- [`atomic_mass_unit` (hep::codata2014)](systems/hep.md#codata2014-atomic_mass_unit)
- [`atomic_mass_unit` (hep::codata2018)](systems/hep.md#codata2018-atomic_mass_unit)
- [`atomic_mass_unit` (hep::codata2022)](systems/hep.md#codata2022-atomic_mass_unit)
- [`avogadro_constant` (hep)](systems/hep.md#avogadro_constant)
- [`avogadro_constant` (si::si2019)](systems/si.md#si2019-avogadro_constant)
- [`bohr_magneton` (hep::codata2014)](systems/hep.md#codata2014-bohr_magneton)
- [`bohr_magneton` (hep::codata2018)](systems/hep.md#codata2018-bohr_magneton)
- [`bohr_magneton` (hep::codata2022)](systems/hep.md#codata2022-bohr_magneton)
- [`bohr_radius` (hep::codata2014)](systems/hep.md#codata2014-bohr_radius)
- [`bohr_radius` (hep::codata2018)](systems/hep.md#codata2018-bohr_radius)
- [`bohr_radius` (hep::codata2022)](systems/hep.md#codata2022-bohr_radius)
- [`boltzmann_constant` (hep::codata2014)](systems/hep.md#codata2014-boltzmann_constant)
- [`boltzmann_constant` (hep::codata2018)](systems/hep.md#codata2018-boltzmann_constant)
- [`boltzmann_constant` (hep::codata2022)](systems/hep.md#codata2022-boltzmann_constant)
- [`boltzmann_constant` (si::si2019)](systems/si.md#si2019-boltzmann_constant)
- [`classical_electron_radius` (hep::codata2014)](systems/hep.md#codata2014-classical_electron_radius)
- [`classical_electron_radius` (hep::codata2018)](systems/hep.md#codata2018-classical_electron_radius)
- [`classical_electron_radius` (hep::codata2022)](systems/hep.md#codata2022-classical_electron_radius)
- [`electron_compton_wavelength` (hep::codata2014)](systems/hep.md#codata2014-electron_compton_wavelength)
- [`electron_compton_wavelength` (hep::codata2018)](systems/hep.md#codata2018-electron_compton_wavelength)
- [`electron_compton_wavelength` (hep::codata2022)](systems/hep.md#codata2022-electron_compton_wavelength)
- [`electron_mass` (hep::codata2014)](systems/hep.md#codata2014-electron_mass)
- [`electron_mass` (hep::codata2018)](systems/hep.md#codata2018-electron_mass)
- [`electron_mass` (hep::codata2022)](systems/hep.md#codata2022-electron_mass)
- [`elementary_charge` (hep)](systems/hep.md#elementary_charge)
- [`elementary_charge` (si::si2019)](systems/si.md#si2019-elementary_charge)
- [`fine_structure_constant` (hep::codata2014)](systems/hep.md#codata2014-fine_structure_constant)
- [`fine_structure_constant` (hep::codata2018)](systems/hep.md#codata2018-fine_structure_constant)
- [`fine_structure_constant` (hep::codata2022)](systems/hep.md#codata2022-fine_structure_constant)
- [`gas_threshold` (hep)](systems/hep.md#gas_threshold)
- [`hyperfine_structure_transition_frequency_of_cs` (si::si2019)](systems/si.md#si2019-hyperfine_structure_transition_frequency_of_cs)
- [`luminous_efficacy` (si::si2019)](systems/si.md#si2019-luminous_efficacy)
- [`magnetic_constant` (si)](systems/si.md#magnetic_constant)
- [`neutron_mass` (hep::codata2014)](systems/hep.md#codata2014-neutron_mass)
- [`neutron_mass` (hep::codata2018)](systems/hep.md#codata2018-neutron_mass)
- [`neutron_mass` (hep::codata2022)](systems/hep.md#codata2022-neutron_mass)
- [`newtonian_constant_of_gravitation` (iau::codata2018)](systems/iau.md#codata2018-newtonian_constant_of_gravitation)
- [`nominal_jovian_equatorial_radius` (iau)](systems/iau.md#nominal_jovian_equatorial_radius)
- [`nominal_jovian_mass_parameter` (iau)](systems/iau.md#nominal_jovian_mass_parameter)
- [`nominal_jovian_polar_radius` (iau)](systems/iau.md#nominal_jovian_polar_radius)
- [`nominal_solar_effective_temperature` (iau)](systems/iau.md#nominal_solar_effective_temperature)
- [`nominal_solar_luminosity` (iau)](systems/iau.md#nominal_solar_luminosity)
- [`nominal_solar_mass_parameter` (iau)](systems/iau.md#nominal_solar_mass_parameter)
- [`nominal_solar_radius` (iau)](systems/iau.md#nominal_solar_radius)
- [`nominal_terrestrial_equatorial_radius` (iau)](systems/iau.md#nominal_terrestrial_equatorial_radius)
- [`nominal_terrestrial_mass_parameter` (iau)](systems/iau.md#nominal_terrestrial_mass_parameter)
- [`nominal_terrestrial_polar_radius` (iau)](systems/iau.md#nominal_terrestrial_polar_radius)
- [`nominal_total_solar_irradiance` (iau)](systems/iau.md#nominal_total_solar_irradiance)
- [`nuclear_magneton` (hep::codata2014)](systems/hep.md#codata2014-nuclear_magneton)
- [`nuclear_magneton` (hep::codata2018)](systems/hep.md#codata2018-nuclear_magneton)
- [`nuclear_magneton` (hep::codata2022)](systems/hep.md#codata2022-nuclear_magneton)
- [`permeability_of_vacuum` (hep)](systems/hep.md#permeability_of_vacuum)
- [`pi` (hep)](systems/hep.md#pi)
- [`pi` (mp_units)](systems/core.md#pi)
- [`planck_constant` (hep)](systems/hep.md#planck_constant)
- [`planck_constant` (si::si2019)](systems/si.md#si2019-planck_constant)
- [`proton_mass` (hep::codata2014)](systems/hep.md#codata2014-proton_mass)
- [`proton_mass` (hep::codata2018)](systems/hep.md#codata2018-proton_mass)
- [`proton_mass` (hep::codata2022)](systems/hep.md#codata2022-proton_mass)
- [`reduced_planck_constant` (natural)](systems/natural.md#reduced_planck_constant)
- [`reduced_planck_constant` (si)](systems/si.md#reduced_planck_constant)
- [`speed_of_light_in_vacuum` (hep)](systems/hep.md#speed_of_light_in_vacuum)
- [`speed_of_light_in_vacuum` (natural)](systems/natural.md#speed_of_light_in_vacuum)
- [`speed_of_light_in_vacuum` (si::si2019)](systems/si.md#si2019-speed_of_light_in_vacuum)
- [`standard_gravity` (si)](systems/si.md#standard_gravity)
- [`standard_pressure` (hep)](systems/hep.md#standard_pressure)
- [`standard_temperature` (hep)](systems/hep.md#standard_temperature)
- [`universe_mean_density` (hep)](systems/hep.md#universe_mean_density)
- [`π` (mp_units)](systems/core.md#π)

**Total constants:** 69