List of Set of Constants
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 name | Short | Value | Unit |
---|---|---|---|
AtomicMassConstant | m_u | 1.66053904e-27 | kg |
AvogadroConstant | N_A | 6.022140857e23 | mol^-1 |
BohrMagneton | μ_B | 9.274009994e-24 | J T^-1 |
BohrRadius | a_0 | 5.2917721067e-11 | m |
BoltzmannConstant | k_B | 1.38064852e-23 | J K^-1 |
CharacteristicImpedanceOfVacuum | Z_0 | 376.73031346177066 | Ω |
ElectricConstant | ε_0 | 8.854187817620389e-12 | F m^-1 |
ElectronMass | m_e | 9.10938356e-31 | kg |
ElementaryCharge | e | 1.6021766208e-19 | C |
FineStructureConstant | α | 0.0072973525664 | |
MagneticConstant | μ_0 | 1.2566370614359173e-6 | N A^-2 |
MolarGasConstant | R | 8.3144598 | J K^-1 mol^-1 |
NeutronMass | m_n | 1.674927471e-27 | kg |
NewtonianConstantOfGravitation | G | 6.67408e-11 | m^3 kg^-1 s^-2 |
PlanckConstant | h | 6.62607004e-34 | J s |
PlanckConstantOver2pi | ħ | 1.0545718001391127e-34 | J s |
ProtonMass | m_p | 1.672621898e-27 | kg |
RydbergConstant | R_∞ | 1.0973731568508e7 | m^-1 |
SpeedOfLightInVacuum | c_0 | 2.99792458e8 | m s^-1 |
StandardAccelerationOfGravitation | g_n | 9.80665 | m s^-2 |
StandardAtmosphere | atm | 101325.0 | Pa |
StefanBoltzmannConstant | σ | 5.670367e-8 | W K^-4 m^-2 |
ThomsonCrossSection | σ_e | 6.6524587158e-29 | m^2 |
WienWavelengthDisplacementLawConstant | b | 0.0028977729 | K m |
CODATA2018
Long name | Short | Value | Unit |
---|---|---|---|
AtomicMassConstant | m_u | 1.6605390666e-27 | kg |
AvogadroConstant | N_A | 6.02214076e23 | mol^-1 |
BohrMagneton | μ_B | 9.2740100783e-24 | J T^-1 |
BohrRadius | a_0 | 5.29177210903e-11 | m |
BoltzmannConstant | k_B | 1.380649e-23 | J K^-1 |
CharacteristicImpedanceOfVacuum | Z_0 | 376.730313668 | Ω |
ElectronMass | m_e | 9.1093837015e-31 | kg |
ElementaryCharge | e | 1.602176634e-19 | C |
FineStructureConstant | α | 0.0072973525693 | |
MolarGasConstant | R | 8.31446261815324 | J K^-1 mol^-1 |
NeutronMass | m_n | 1.67492749804e-27 | kg |
NewtonianConstantOfGravitation | G | 6.6743e-11 | m^3 kg^-1 s^-2 |
PlanckConstant | h | 6.62607015e-34 | J s |
ProtonMass | m_p | 1.67262192369e-27 | kg |
ReducedPlanckConstant | ħ | 1.0545718176461565e-34 | J s |
RydbergConstant | R_∞ | 1.097373156816e7 | m^-1 |
SpeedOfLightInVacuum | c_0 | 2.99792458e8 | m s^-1 |
StandardAccelerationOfGravitation | g_n | 9.80665 | m s^-2 |
StandardAtmosphere | atm | 101325.0 | Pa |
StefanBoltzmannConstant | σ | 5.6703744191844294e-8 | W K^-4 m^-2 |
ThomsonCrossSection | σ_e | 6.6524587321e-29 | m^2 |
VacuumElectricPermittivity | ε_0 | 8.8541878128e-12 | F m^-1 |
VacuumMagneticPermeability | μ_0 | 1.25663706212e-6 | N A^-2 |
WienFrequencyDisplacementLawConstant | b′ | 5.878925757646825e10 | Hz K^-1 |
WienWavelengthDisplacementLawConstant | b | 0.0028977719551851727 | K m |