Iran Civil Center

ISSN: 1735–2614
November 21, 2008
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Fundamental Constants

 Name  Symbol   Value  Definition 
 Acceleration due to gravity  g  9.80665 m s-2  
 Atomic Mass Unit  mu  1.66053873 X 10-27 kg  
 Avogadro's number  NA  6.02214199 X 1023 mol-1  
 Bohr magneton  μB  9.27400899 X 10-24 J T-1  eh/(4πme)
 Bohr Radius  a0  5.291772083 X 10-11 m  
 Boltzmann constant  k  1.3806503 X 10-23 J K-1  R/NA
 Charge-to-mass ratio for electron  -e / me  1.7588047 X 1011 C kg-1  
 Conductance quantum  G0  7.748091696 X 10-5 S  2e2/h
 Electron Compton wavelength  lc  2.426310215 X 10-12 m  
 Electron magnetic moment  me  -9.28476362 X 10-24 J T-1  -1/2 geμB
 Electron radius (classical)  re  2.817940285 X 10-15 m  α2 . a0
 electron volt  eV  1.602176 X 10-19 J  
 Electronic rest mass  me  9.10938188 X 10-31 kg  
 elementary charge  e  1.60217733 X 10-19 C  
 Faraday's constant  F  9.6485309 X 104 C mol-1  NA . e
 Fine-Structure Constant  α  7.29735308 X 10-3  
 Free electron g factor  ge  -2.002319304386  
 Free electron gyromagnetic ratio  γe  1.760859794 X 10-18s-1T-1  2πgeμB/h
 Gravitational constant  G  6.67259 X 10-11m3kg-1s-2  
 Hartree Energy  Eh  4.35974381 X 10-18 J  e2/(4πe0a0)
 Loschmidt's number  NL  2.686763 X 1025 m-3  
 Magnetic Flux Quantum  Φ0  2.067833636 X 10-15 Wb  
 Molar gas constant  R  8.314510 J K-1 mol-1  
 Molar Volume, Ideal Gas
(at 273.15 K, 101.325 kPa)		  Vm  22.413996 m3 kmol-1  
 Neutron Mass  mn  1.67492716 X 10-27 kg  
 Nuclear magneton  μN  5.05078317-27 J T-1  eh/(4πmp)
 Permeability of vacuum (magnetic constant)  μ0  4π X 10-7 T2 m3 J-1  
 Permittivity of vacuum (electric constant)  ε0  8.854187817 X 10-12 F m-1  1/(μ0c2) [exact]
 Proton g factor (Lande factor)  gp  5.585694675  2μp/μN
 Proton gyromagnetic ratio (H2O)  γp  2.67522212 s-1 T-1  
 Proton magnetic moment  μp  1.41060761 X 10-26 J T-1  
 Proton rest mass  mp  1.6726231 X 10-27 kg  
 Speed of light in a vacuum  c  2.99792458 X 108 m s-1  
 Standard atmosphere  p0  1.01325 X 105 Pa  
 Stefan-Boltzmann constant  σ  5.67051 X 10-8 W m-2 K-4  
 Wien displacement law constant  b  2.8977686 X 10-3 m K