A more complete (and up to date) table can be seen here.
Fundamental Physical Constants
|
#
|
Constant
|
Symbol
|
Value
|
Units
|
|
1
|
Speed of light in vacuum | $\text{c}$ |
299792458
|
m s-1 |
|
2
|
Permeability of vacuum | $\mu_0$ |
1.25663706143592e-06
|
N A-2 |
|
3
|
Permittivity of vacuum | $\epsilon_0$ |
8.854187817e-12
|
F m-1 |
|
4
|
Newtonian constant of gravitation | $\text{G}$ |
6.67259e-11 ± 8.5e-15
|
m3 kg-1 s-2 |
|
5
|
Planck constant | $\text{h}$ |
6.6260755e-34 ± 4.0e-40
|
J s |
|
6
|
Planck constant in eV |
4.1356692e-15 ± 1.2e-21
|
eV s | |
|
7
|
h-bar | $\hbar$ |
1.05457266e-34 ± 6.3e-41
|
J s |
|
8
|
h-bar in eV |
6.582122e-16 ± 2.0e-22
|
eV s | |
|
9
|
Planck mass | $\text{m}_\text{p}$ |
2.17671e-08 ± 1.4e-12
|
kg |
|
10
|
Planck length | $\text{l}_\text{p}$ |
1.61605e-35 ± 1.0e-39
|
m |
|
11
|
Planck time | $\text{t}_\text{p}$ |
5.39056e-44 ± 3.4e-48
|
s |
|
12
|
Elementary charge | $\text{e}$ |
1.60217733e-19 ± 4.9e-26
|
C |
|
13
|
Magnetic flux quantum | $\phi_0$ |
2.06783461e-15 ± 6.1e-22
|
Wb |
|
14
|
Josephson frequency-voltage quotient |
4.8359767e+14 ± 1.4e+08
|
V-1 s-1 | |
|
15
|
Quantized Hall conductance |
3.87404614e-05 ± 1.7e-12
|
Ω-1 | |
|
16
|
Quantized Hall resistance | $\text{R}_\text{H}$ |
25812.8056 ± 0.0012
|
Ω |
|
17
|
Bohr magneton | $\mu_\text{B}$ |
9.2740154e-24 ± 3.1e-30
|
J T-1 |
|
18
|
Bohr magneton in eV |
5.78838263e-05 ± 5.2e-12
|
eV T-1 | |
|
19
|
Bohr magneton in Hz |
13996241800 ± 4200
|
T-1 s-1 | |
|
20
|
Bohr magneton in wavenumbers |
46.686437 ± 1.4e-05
|
m-1 T-1 | |
|
21
|
Bohr magneton in kelvins |
0.6717099 ± 5.7e-06
|
K T-1 | |
|
22
|
Nuclear magneton | $\mu_\text{N}$ |
5.0507866e-27 ± 1.7e-33
|
J T-1 |
|
23
|
Nuclear magneton in eV |
3.15245166e-08 ± 2.8e-15
|
eV T-1 | |
|
24
|
Nuclear magneton in Hz |
7622591.4 ± 2.3
|
T-1 s-1 | |
|
25
|
Nuclear magneton in wavenumbers |
0.0254262281 ± 7.7e-09
|
m-1 T-1 | |
|
26
|
Nuclear magneton in kelvins |
3.658246e-04 ± 3.1e-09
|
K T-1 | |
|
27
|
Fine structure constant | $\alpha$ |
0.00729735308 ± 3.3e-10
|
|
|
28
|
Inverse fine structure constant |
137.0359895 ± 6.1e-06
|
||
|
29
|
Rydberg constant | $\text{Ry}$ |
10973731.534 ± 0.013
|
m-1 |
|
30
|
Rydberg constant in Hz |
3.2898419499e+15 ± 3.9e+06
|
s-1 | |
|
31
|
Rydberg constant in joules |
2.1798741e-18 ± 1.3e-24
|
J | |
|
32
|
Rydberg constant in eV |
13.6056981 ± 4.0e-06
|
eV | |
|
33
|
Bohr radius | $\text{a}_0$ |
5.29177249e-11 ± 2.4e-18
|
m |
|
34
|
Hartree energy | $\text{E}_\text{h}$ |
4.3597482e-18 ± 2.6e-24
|
J |
|
35
|
Hartree energy in eV |
27.2113961 ± 8.1e-06
|
eV | |
|
36
|
Quantum of circulation |
3.63694807e-04 ± 3.3e-11
|
m2 s-1 | |
|
37
|
Electron mass | $\text{m}_\text{e}$ |
9.1093897e-31 ± 5.4e-37
|
kg |
|
38
|
Electron mass in u |
5.48579903e-04 ± 1.3e-11
|
u | |
|
39
|
Electron mass in eV |
510999.06 ± 0.15
|
eV | |
|
40
|
Electron-muon mass ratio |
0.00483633218 ± 7.1e-10
|
||
|
41
|
Electron-proton mass ratio |
5.44617013e-04 ± 1.1e-11
|
||
|
42
|
Electron-deuteron mass ratio |
2.72443707e-04 ± 6e-12
|
||
|
43
|
Electron-alpha-particle mass ratio |
1.37093354e-04 ± 3e-12
|
||
|
44
|
Electron specific charge |
-175881962000 ± -53000
|
C kg-1 | |
|
45
|
Electron molar mass |
5.48579903e-07 ± 1.3e-14
|
kg mol-1 | |
|
46
|
Electron Compton wavelength | $\lambda_\text{C}$ |
2.42631058e-12 ± 2.2e-19
|
m |
|
47
|
Electron Compton wavelength over 2 pi | $\text{ƛ}_\text{C}$ |
3.86159323e-13 ± 3.5e-20
|
m |
|
48
|
Electron classical radius | $\text{r}_\text{e}$ |
2.81794092e-15 ± 3.8e-22
|
m |
|
49
|
Electron Thomson cross section | $\sigma_\text{e}$ |
6.6524616e-29 ± 1.8e-35
|
m2 |
|
50
|
Electron magnetic mom. |
9.2847701e-24 ± 3.1e-30
|
J T-1 | |
|
51
|
Electron magnetic mom. in Bohr magnetons |
1.001159652193 ± 1.0e-11
|
||
|
52
|
Electron magnetic mom. in nuclear magnetons |
1838.282 ± 3.7e-05
|
||
|
53
|
Electron magnetic mom. anomaly | $\text{a}_\text{e}$ |
0.001159652193 ± 1.0e-11
|
|
|
54
|
Electron g-factor | $\text{g}_\text{e}$ |
2.002319304386 ± 2.0e-11
|
|
|
55
|
Electron-muon magnetic mom. ratio |
206.766967 ± 3.0e-05
|
||
|
56
|
Electron-proton magnetic mom. ratio |
658.2106881 ± 6.6e-06
|
||
|
57
|
Muon mass |
1.8835327e-28 ± 1.1e-34
|
kg | |
|
58
|
Muon mass in u |
0.113428913 ± 1.7e-08
|
u | |
|
59
|
Muon mass in eV |
105658389 ± 34
|
eV | |
|
60
|
Muon-electron mass ratio |
206.768262 ± 3.0e-05
|
||
|
61
|
Muon molar mass |
1.13428913e-04 ± 1.7e-11
|
kg mol-1 | |
|
62
|
Muon magnetic mom. |
4.4904514e-26 ± 1.5e-32
|
J T-1 | |
|
63
|
Muon magnetic mom. in Bohr magnetons |
0.00484197097 ± 7.1e-10
|
||
|
64
|
Muon magnetic mom. in nuclear magnetons |
8.8905981 ± 1.3e-06
|
||
|
65
|
Muon magnetic mom. anomaly | $\text{a}_\mu$ |
0.001165923 ± 8.4e-09
|
|
|
66
|
Muon g-factor | $\text{g}_\mu$ |
2.002331846 ± 1.7e-08
|
|
|
67
|
Muon-proton magnetic mom. ratio |
3.18334547 ± 4.7e-07
|
||
|
68
|
Proton mass | $\text{m}_\text{p}$ |
1.6726231e-27 ± 1.0e-33
|
kg |
|
69
|
Proton mass in u |
1.00727647 ± 1.2e-08
|
u | |
|
70
|
Proton mass in eV |
938272310 ± 280
|
eV | |
|
71
|
Proton-electron mass ratio |
1836.152701 ± 3.7e-05
|
||
|
72
|
Proton-muon mass ratio |
8.8802444 ± 1.3e-06
|
||
|
73
|
Proton specific charge |
95788309 ± 29
|
C kg-1 | |
|
74
|
Proton molar mass |
0.00100727647 ± 1.2e-11
|
kg mol-1 | |
|
75
|
Proton Compton wavelength | $\lambda_\text{C}, \text{p}$ |
1.32141002e-15 ± 1.2e-22
|
m |
|
76
|
Proton magnetic mom. |
1.41060761e-26 ± 4.7e-33
|
J T-1 | |
|
77
|
Proton magnetic mom. in Bohr magnetons |
0.001521032202 ± 1.5e-11
|
||
|
78
|
Proton magnetic mom. in nuclear magnetons |
2.792847386 ± 6.3e-08
|
||
|
79
|
Diamagnetic shielding correction for protons (H2O, spherical sample, 298.15 K) | $\sigma_\text{H2O}$ |
2.5689e-05 ± 1.5e-08
|
|
|
80
|
Shielded proton mom. (H2O, spherical sample, 298.15 K) | $\mu_\text{p}^’$ |
1.41057138e-26 ± 4.7e-33
|
J T-1 |
|
81
|
Shielded proton mom. in Bohr magnetons |
0.001520993129 ± 1.7e-11
|
||
|
82
|
Shielded proton mom. in nuclear magnetons |
2.792775642 ± 6.4e-08
|
||
|
83
|
Proton gyromagnetic ratio | $\gamma_\text{p}$ |
267522128 ± 81
|
T-1 s-1 |
|
84
|
Proton gyromagnetic ratio over 2 pi | $\frac{\gamma_\text{p}}{2\pi}$ |
42577469 ± 13
|
T-1 s-1 |
|
85
|
Proton gyromagnetic ratio, uncorrected (H2O, spherical sample, 298.15 K) | $\gamma_\text{p}^’$ |
267515255 ± 81
|
T-1 s-1 |
|
86
|
Proton gyromagnetic ratio, uncorrected (H2O, spherical sample, 298.15 K) over 2 pi | $\frac{\gamma_\text{p}^’}{2\pi}$ |
42576375 ± 13
|
T-1 s-1 |
|
87
|
Neutron mass | $\text{m}_\text{n}$ |
1.6749286e-27 ± 1.0e-33
|
kg |
|
88
|
Neutron mass in u |
1.008664904 ± 1.4e-08
|
u | |
|
89
|
Neutron mass in eV |
939565630 ± 280
|
eV | |
|
90
|
Neutron-electron mass ratio |
1838.683662 ± 4.0e-05
|
||
|
91
|
Neutron-proton mass ratio |
1.001378404 ± 9e-09
|
||
|
92
|
Neutron molar mass |
0.001008664904 ± 1.4e-11
|
kg mol-1 | |
|
93
|
Neutron Compton wavelength | $\lambda_\text{C}, \text{n}$ |
1.3195911e-15 ± 1.2e-22
|
m |
|
94
|
Neutron magnetic mom. |
9.6623707e-27 ± 4.0e-33
|
J T-1 | |
|
95
|
Neutron magnetic mom. in Bohr magnetons |
0.00104187563 ± 2.5e-10
|
||
|
96
|
Neutron magnetic mom. in nuclear magnetons |
1.91304275 ± 4.5e-07
|
||
|
97
|
Neutron-electron magnetic mom. ratio |
0.00104066882 ± 2.5e-10
|
||
|
98
|
Neutron-proton magnetic mom. ratio |
0.68497934 ± 1.6e-07
|
||
|
99
|
Deuteron mass | $\text{m}_\text{d}$ |
3.343586e-27 ± 2.0e-33
|
kg |
|
100
|
Deuteron mass in u |
2.013553214 ± 2.4e-08
|
u | |
|
101
|
Deuteron mass in eV |
1875613390 ± 570
|
eV | |
|
102
|
Deuteron-electron mass ratio |
3670.483014 ± 7.5e-05
|
||
|
103
|
Deuteron-proton mass ratio |
1.999007496 ± 6e-09
|
||
|
104
|
Deuteron molar mass |
0.002013553214 ± 2.4e-11
|
kg mol-1 | |
|
105
|
Deuteron magnetic mom. | $\mu_\text{d}$ |
4.3307375e-27 ± 1.5e-33
|
J T-1 |
|
106
|
Deuteron magnetic mom. in Bohr magnetons |
4.669754479e-04 ± 9.1e-12
|
||
|
107
|
Deuteron magnetic mom. in nuclear magnetons |
0.85743823 ± 2.4e-08
|
||
|
108
|
Deuteron-electron magnetic mom. ratio |
4.66434546e-04 ± 9.1e-12
|
||
|
109
|
Deuteron-proton magnetic mom. ratio |
0.3070122035 ± 5.1e-09
|
||
|
110
|
Avagadro constant | $\text{N}_\text{A}$ |
6.0221367e+23 ± 3.6e+17
|
mol-1 |
|
111
|
Atomic mass constant | $\text{m}_\text{u}$ |
1.6605402e-27 ± 1.0e-33
|
kg |
|
112
|
Atomic mass constant in eV |
931494320 ± 280
|
eV | |
|
113
|
Faraday constant | $\text{F}$ |
96485.309 ± 0.029
|
C mol-1 |
|
114
|
Molar Planck constant |
3.99031323e-10 ± 3.6e-17
|
J s mol-1 | |
|
115
|
molar Planck constant times c | $\text{N}_\text{A} \text{hc}$ |
0.11962658 ± 1.1e-07
|
J m mol-1 |
|
116
|
Molar gas constant | $\text{R}$ |
8.31451 ± 7.0e-05
|
J mol-1 K-1 |
|
117
|
Boltzmann constant | $\text{k}$ |
1.380658e-23 ± 1.2e-28
|
J K-1 |
|
118
|
Boltzmann constant in eV |
8.617385e-05 ± 7.3e-10
|
eV K-1 | |
|
119
|
Boltzmann constant in Hz |
20836740000 ± 180000
|
K-1 s-1 | |
|
120
|
Boltzmann constant in wavenumbers |
69.50387 ± 0.00059
|
m-1 K-1 | |
|
121
|
Molar volume (ideal gas), STP | $\text{V}_\text{m}$ |
0.0224141 ± 1.9e-07
|
m3 mol-1 |
|
122
|
Loschmidt constant | $\text{n}_0$ |
2.686763e+25 ± 2.3e+20
|
m-3 |
|
123
|
Stefan-Boltzmann constant | $\sigma$ |
5.67051e-08 ± 1.9e-12
|
W m-2 K-4 |
|
124
|
First radiation constant | $\text{c}_1$ |
3.7417749e-16 ± 2.2e-22
|
W m2 |
|
125
|
Second radiation constant | $\text{c}_2$ |
0.01438769 ± 1.2e-07
|
m K |
|
126
|
Wien displacement law constant | $\text{b}$ |
0.002897756 ± 2.4e-08
|
m K |
|
127
|
Electron volt | $\text{eV}$ |
1.60217733e-19 ± 4.9e-26
|
J |
|
128
|
Atomic mass unit | $\text{u}$ |
1.6605402e-27 ± 1.0e-33
|
kg |
|
129
|
Standard atmosphere | $\text{atm}$ |
101325
|
Pa |
|
130
|
Standard acceleration of gravity | $\text{g}_\text{n}$ |
9.80665
|
m s-2 |
|
131
|
BIPM-maintained ohm, Ω_69-B1 | $\Omega_\text{B185}$ |
1-1.563e-6 ± 5.0e-08
|
Ω |
|
132
|
Drift rate of Ω_69-B1 | $\frac{d\Omega_\text{69-B1}}{dt}$ |
-0.0566 ± -0.0015
|
μΩ/yr |
|
133
|
BIPM-maintained volt 483 694 GHz(h/2e) | $\text{V}_\text{76-B1}$ |
1-7.59e-6 ± 3.0e-07
|
V |
|
134
|
BIPM maintained ampere A_BIPM | $\text{A}_\text{B185}$ |
1-6.03e-6 ± 3.0e-07
|
A |
|
135
|
Cu x-unit: | $\text{xu}(\text{CuK}\alpha 1)$ |
1.00207789e-13 ± 7.0e-20
|
m |
|
136
|
Mo x-unit: | $\text{xu}(\text{MoK}\alpha 1)$ |
1.00209938e-13 ± 4.5e-20
|
m |
|
137
|
AA *: | $\text{A} \text{Å}^*$ |
1.00001481e-10 ± 9.2e-17
|
m |
|
138
|
Lattice spacing of Si (in vacuum, 295.65 K) | $\text{a}$ |
5.4310196e-10 ± 1.1e-16
|
m |
|
139
|
Lattice spacing Si (220) plane | $\text{d}_{220}$ |
1.9201554e-10 ± 4.0e-17
|
m |
|
140
|
Molar volume of Si | $\text{V}_m(\text{Si})$ |
1.20588179e-05 ± 8.9e-12
|
m3 mol-1 |