Visit NIST for all constants, units, and uncertainties This is their Extensive Listing of constants
Name
Symbol
Value
Boltzmann
k
8.617 343 x 10-5 eV (molecule·K) 1.380 650 5 x 10-23 J/K
Charge Density†
1.081 202 317 x 1012 C/m3
Conductance Quantum
G0
7.748 091 733 x 10-5 S
Current†
6.623 617 82 x 10-3 Ω
Electron Charge/Mass Ratio
e/me
1.758 820 12 x 1011 C/kg
Electric Dipole Moment†
8.478 353 09 x 10-30 C·m
Electric Field†
5.142 206 42 x 1011 V/m
Electric Field Gradient†
9.717 361 82 x 1021 V/m2
Electric Potential†
27.211 384 5 V
Electric Quadrupole Moment†
4.486 551 24 x 10-40 C·m2
Electron Volt
eV
1.602 176 53 x 10-19 J
Elementary Charge
e
1.602 176 53 x 10-19 C
Impedance of Free Space
Z0
376.730 313 461 (120·π) Ω
Josephson
KJ
2.350 517 42 x 105 T
Magnetic Flux Quantum
F0
2.067 833 72 x 10-15 Wb
Magnetic Flux Density†
4.486 551 24 x 10-40 C·m2
Magnetizability†
7.891 036 60 x 10-29 J/T2
Magnetic Flux Dipole Moment†
1.854 801 90 x 10-23 J/T
Permeability of Free Space
m0
1.256 637 061 4 x 10-6 H/m (N/A2)
Permittivity of Free Space
e0
8.854 187 817 x 10-12 F/m
Planck *
h
4.135 667 43 x 10-15 eV·s 6.626 069 3 x 10-34 J·s
von Klitzing
RK
25 812.807 449 Ω
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