List of Constants · PhysicalConstants

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 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`

CODATA2022

Long name	Short	Value	Unit
`AtomicMassConstant`	`m_u`	1.66053906892e-27	`kg`
`AvogadroConstant`	`N_A`	6.02214076e23	`mol^-1`
`BohrMagneton`	`μ_B`	9.2740100657e-24	`J T^-1`
`BohrRadius`	`a_0`	5.29177210544e-11	`m`
`BoltzmannConstant`	`k_B`	1.380649e-23	`J K^-1`
`CharacteristicImpedanceOfVacuum`	`Z_0`	376.730313412	`Ω`
`ElectronMass`	`m_e`	9.1093837139e-31	`kg`
`ElementaryCharge`	`e`	1.602176634e-19	`C`
`FineStructureConstant`	`α`	0.0072973525643
`MolarGasConstant`	`R`	8.31446261815324	`J K^-1 mol^-1`
`NeutronMass`	`m_n`	1.67492750056e-27	`kg`
`NewtonianConstantOfGravitation`	`G`	6.6743e-11	`m^3 kg^-1 s^-2`
`PlanckConstant`	`h`	6.62607015e-34	`J s`
`ProtonMass`	`m_p`	1.67262192595e-27	`kg`
`ReducedPlanckConstant`	`ħ`	1.0545718176461565e-34	`J s`
`RydbergConstant`	`R_∞`	1.0973731568157e7	`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`	6.6524587051e-29	`m^2`
`VacuumElectricPermittivity`	`ε_0`	8.8541878188e-12	`F m^-1`
`VacuumMagneticPermeability`	`μ_0`	1.25663706127e-6	`N A^-2`
`WienFrequencyDisplacementLawConstant`	`b′`	5.878925757646825e10	`Hz K^-1`
`WienWavelengthDisplacementLawConstant`	`b`	0.0028977719551851727	`K m`