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 Important Physics Constants
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Constant Name Symbol Value
Planck constant h 6.6260755·10-34 J·s

h / (2 .pi.) = 1.05457266·10-34 J·s
Boltzmann constant kB 1.380658·10-23 J/K        ( = 8.617385·10-5 eV/K )
Elementary charge e 1.60217733·10-19 C
Avogadro number NA 6.0221367·1023 particles/mol
Speed of light c 2.99792458·108 m/s
Permeability of vacuum .mu.0 .mu.0 = 4 .pi. ·10-7 T2·m3/J

12.566370614·10-7 T2·m3/J
Permittivity of vacuum .epsilon.0 .epsilon.0 = 1 / (.mu.0 c2)           

8.854187817·10-12 C2/J·m
Fine structure constant .alpha. 1 / 137.0359895
Electron rest mass me 9.1093897·10-31 kg
Proton rest mass mp 1.6726231·10-27 kg
Neutron rest mass mn 1.6749286·10-27 kg
Bohr magneton .mu.B .mu.B = e h / (4 .pi. me)

9.2740154·10-24 J/T
Nuclear magneton .mu.N .mu.N = e h / (4 .pi. mp)

5.0507866·10-27 J/T
Free electron g factor ge 2.002319304386
Free electron gyromagnetic ratio .gamma.e .gamma.e = 2 .pi. ge .mu.B / h  =1.7608592·1011 1/s·T

.gamma.e / (2 .pi.) = 28.024944 GHz/T
Electron magnetic moment .mu.e .mu.e = -(1/2) ge .mu.B  = -9.2847701·10-24 J/T
Proton magnetic moment .mu.p 1.41060761·10-26 J/T
Proton-electron ratios   mp / me = 1836.152701

.mu.e / .mu.p = 658.2106881

.gamma.e / .gamma.p = 658.2275841 (protons in water)
Atomic mass unit amu 1.66054·10-27 kg
Bohr radius a0 5.29177·10-11 m
Electron radius re 2.81792·10-15 m
Gas constant R R = NA kB   =  8.31451 m2·kg/s2·K·mol
 
 

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