List of Set of Constants

Note

Each dataset listed below exports by default only the full long names of the constants. Short aliases are provided for convenience, but they are not exported, to avoid polluting the main namespace with dozens of short-named variables. Users can to import the short names of the variables they use most frequently, as shown in the examples above.

CODATA2014

Long nameShortValueUnit
AtomicMassConstantm_u1.66053904e-27kg
AvogadroConstantN_A6.022140857e23mol^-1
BohrMagnetonμ_B9.274009994e-24J T^-1
BohrRadiusa_05.2917721067e-11m
BoltzmannConstantk_B1.38064852e-23J K^-1
CharacteristicImpedanceOfVacuumZ_0376.73031346177066Ω
ElectricConstantε_08.854187817620389e-12F m^-1
ElectronMassm_e9.10938356e-31kg
ElementaryChargee1.6021766208e-19C
FineStructureConstantα0.0072973525664
MagneticConstantμ_01.2566370614359173e-6N A^-2
MolarGasConstantR8.3144598J K^-1 mol^-1
NeutronMassm_n1.674927471e-27kg
NewtonianConstantOfGravitationG6.67408e-11m^3 kg^-1 s^-2
PlanckConstanth6.62607004e-34J s
PlanckConstantOver2piħ1.0545718001391127e-34J s
ProtonMassm_p1.672621898e-27kg
RydbergConstantR_∞1.0973731568508e7m^-1
SpeedOfLightInVacuumc_02.99792458e8m s^-1
StandardAccelerationOfGravitationg_n9.80665m s^-2
StandardAtmosphereatm101325.0Pa
StefanBoltzmannConstantσ5.670367e-8W K^-4 m^-2
ThomsonCrossSectionσ_e6.6524587158e-29m^2
WienWavelengthDisplacementLawConstantb0.0028977729K m

CODATA2018

Long nameShortValueUnit
AtomicMassConstantm_u1.6605390666e-27kg
AvogadroConstantN_A6.02214076e23mol^-1
BohrMagnetonμ_B9.2740100783e-24J T^-1
BohrRadiusa_05.29177210903e-11m
BoltzmannConstantk_B1.380649e-23J K^-1
CharacteristicImpedanceOfVacuumZ_0376.730313668Ω
ElectronMassm_e9.1093837015e-31kg
ElementaryChargee1.602176634e-19C
FineStructureConstantα0.0072973525693
MolarGasConstantR8.31446261815324J K^-1 mol^-1
NeutronMassm_n1.67492749804e-27kg
NewtonianConstantOfGravitationG6.6743e-11m^3 kg^-1 s^-2
PlanckConstanth6.62607015e-34J s
ProtonMassm_p1.67262192369e-27kg
ReducedPlanckConstantħ1.0545718176461565e-34J s
RydbergConstantR_∞1.097373156816e7m^-1
SpeedOfLightInVacuumc_02.99792458e8m s^-1
StandardAccelerationOfGravitationg_n9.80665m s^-2
StandardAtmosphereatm101325.0Pa
StefanBoltzmannConstantσ5.6703744191844294e-8W K^-4 m^-2
ThomsonCrossSectionσ_e6.6524587321e-29m^2
VacuumElectricPermittivityε_08.8541878128e-12F m^-1
VacuumMagneticPermeabilityμ_01.25663706212e-6N A^-2
WienFrequencyDisplacementLawConstantb′5.878925757646825e10Hz K^-1
WienWavelengthDisplacementLawConstantb0.0028977719551851727K m