| Constant
| Symbol
| Value
| Est. error limit***
| Unit
|
| Systeme International (MKSA)
| Centimeter-gram-second
|
| Speed of light in vacuum
| c
| 2.997925
| 3
| X 108
| m s-1
| X 1010
| cm s-1
|
| Elementary charge
| e
| 1.60210
| 7
| 10-19
| C
| 10-20
| cm1/2g1/2*
|
|
|
| 4.80298
| 20
|
|
| 10-10
| cm3/2g1/2s-1**
|
| Avogadro constant
| NA
| 6.02252
| 28
| 1023
| mol-1
| 1023
| mol-1
|
| Electron rest mass
| me
| 9.1091
| 4
| 10-31
| kg
| 10-28
| g
|
|
|
| 5.48597
| 9
| 10-4
| u
| 10-4
| u
|
| Proton rest mass
| mp
| 1.67252
| 8
| 10-27
| kg
| 10-24
| g
|
|
|
| 1.00727663
| 24
| 100
| u
| 100
| u
|
| Neutron rest mass
| mn
| 1.67482
| 8
| 10-27
| kg
| 10-24
| g
|
|
|
| 1.0086654
| 13
| 100
| u
| 100
| u
|
| Faraday constant
| F
| 9.64870
| 16
| 104
| C mol-1
| 103
| cm1/2g1/2mol-1*
|
|
|
| 2.89261
| 5
|
|
| 1014
| cm3/2g1/2s-1mol-1**
|
| Planck constant
| h
| 6.6256
| 5
| 10-34
| J s
| 10-27
| erg s
|
|
|
| 1.05450
| 7
| 10-34
| J s
| 10-27
| erg s
|
| Fine structure constant
| α
| 7.29720
| 10
| 10-3
|
| 10-3
|
|
|
| 1/α
| 1.370388
| 19
| 102
|
| 102
|
|
|
| α/2π
| 1.161385
| 16
| 10-3
|
| 10-3
|
|
|
| α2
| 5.32492
| 14
| 10-5
|
| 10-5
|
|
| Charge to mass ratio for electron
| e/me
| 1.758796
| 19
| 1011
| C kg-1
| 107
| cm1/2g-1/2*
|
|
|
| 5.27274
| 6
|
|
| 1017
| cm3/2g-1/2s-1**
|
| Quantum-charge ratio
| h/e
| 4.13556
| 12
| 10-15
| J s C-1
| 10-7
| cm3/2g1/2s-1*
|
|
|
| 1.37947
| 4
|
|
| 10-17
| cm1/2g-1/2**
|
| Compton wavelength of electron
| λc
| 2.42621
| 6
| 10-12
| m
| 10-10
| cm
|
|
| λc/2π
| 3.86144
| 9
| 10-13
| m
| 10-11
| cm
|
| Compton wavelength of proton
| λc, p
| 1.32140
| 4
| 10-15
| m
| 10-13
| cm
|
|
| λc, p/2π
| 2.10307
| 6
| 10-16
| m
| 10-14
| cm
|
| Rydberg constant
| Rinfinity
| 1.0973731
| 3
| 107
| m-1
| 105
| cm-1
|
| Bohr radius
| a0
| 5.29167
| 7
| 10-11
| m
| 10-9
| cm
|
| Electron radius
| re
| 2.81777
| 11
| 10-15
| m
| 10-13
| cm
|
|
| r2e
| 7.9398
| 6
| 10-30
| m2
| 10-26
| cm2
|
| Thomson cross section
| 8πr2e/3
| 6.6516
| 5
| 10-29
| m2
| 10-25
| cm2
|
| Gyromagnetic ratio of proton
| γ
| 2.67519
| 2
| 108
| rad s-1T-1
| 104
| rad s-1G-1*
|
|
| γ/2π
| 4.25770
| 3
| 107
| Hz T-1
| 103
| s-1G-1*
|
| --(uncorrectedd for diamagnetism, H2O)
| λ'
| 2.67512
| 2
| 108
| rad s-1T-1
| 104
| rad s-1G-1*
|
|
| λ'/2π
| 4.25759
| 3
| 107
| Hz T-1
| 103
| s-1G-1*
|
| Bohr magneton
| μB
| 9.2732
| 6
| 10-24
| J T-1
| 10-21
| erg G-1*
|
| Nuclear magneton
| μn
| 5.0505
| 4
| 10-27
| J T-1
| 10-25
| erg G-1*
|
| Proton moment
| μP
| 1.41049
| 13
| 10-26
| J T-1
| 10-23
| erg G-1*
|
|
| μp/μN
| 2.79276
| 7
| 100
|
| 100
|
|
| --(uncorrected for diamagnetism, H20)
| μp/μn
| 2.79268
| 7
| 100
|
| 100
|
|
| Anomalous electron moment corrn.
| (μe/μ0)-1
| 1.159615
| 15
| 10-3
|
| 10-3
|
|
| Zeeman splitting constant
| μB/hc
| 4.66858
| 4
| 101
| m-1T-1
| 10-5
| cm-1G-1*
|
| Gas constant
| R
| 8.3143
| 12
| 100
| J °K-1 mol-1
| 107
| erg °K-1 mol-1
|
| Normal volume perfect gas
| V0
| 2.24136
| 30
| 10-2
| m3 mol-1
| 104
| cm3 mol-1
|
| Boltzman constant
| k
| 1.38054
| 18
| 10-23
| J °K-1
| 107
| erg °K-1
| |
| First radiation constant (2πhc2)
| c1
| 3.7415
| 3
| 10-16
| W m2
| 10-5
| erg cm2 s-1
|
| Second radiation constant
| c2
| 1.43879
| 19
| 10-2
| m °K
| 100
| cm °K
|
| Wien displacement constant
| b
| 2.8978
| 4
| 10-3
| m °K
| 10-1
| cm °K
|
| Stefan-Boltzmann constant
| σ
| 5.6697
| 29
| 10-8
| W m-2°K-4
| 10-5
| erg cm-2 s-1 °K-4
|
| Gravitational constant
| G
| 6.670
| 15
| 10-11
| N m2 kg-2
| 10-8
| dyn cm2 g-2
|