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Table of ConstantsEdit

Fundamental constants from NIST Physics Lab
Name Symbol Value Units Relative Uncertainty
Speed of light (in vacuum)       (exact)
Magnetic constant       (exact)
Electric constant       (exact)
Newtonian gravitational constant        
Plank's constant        
Elementary charge        
Mass of the electron        
Mass of the proton        
Mass of a neutron  
Fine structure constant     dimentionless  
Molar gass constant        
Boltzmann's constant        
Avogadro's number        
Rydberg constant        
Atmosphere     (exact)
Electronvolt    
Bohr radius    
Coulomb's constant    
Faraday constant    
Gravitational acceleration on Earth  
Mass of the Earth
Mass of the Moon
Mean radius of the Earth
Mean radius of the Moon
Dirac's Constant  
Speed of sound in air at STP
Unified Atomic Mass Unit  
Vacuum Permittivity  
  • 1 Atmosphere Pressure (1 atm) : 1.0 × 105 N/m2 = 1.0 × 105 Pa
  • 1 Electron Volt (1 eV) : 1.60 × 10−19 J
  • Bohr radius (a0) : 5.292 × 10−11 m
  • Coulomb's Law Constant (k) : 1/(4 π ε0) = 9.0 × 109 N·m2/C2
  • Faraday constant (F) : 96,485 C·mol−1
  • Gravitational accelaration (g) : 9.80665 m·s-2
  • Mass of a neutron (mn) : 1.67495 × 10−27 kg
  • Mass of Earth : 5.98 × 1024 kg
  • Mass of the Moon : 7.35 × 1022 kg
  • Mean radius of Earth : 6.37 × 106 m
  • Mean radius of the Moon : 1.74 × 106 m
  • Dirac's Constant ( ) :   = 1.05457148 × 10−34 J·s
  • Speed of sound in air at STP : 3.31 × 102 m/s
  • Unified Atomic Mass Unit (u) : 1.66 × 10−27 kg
  • Vacuum Permittivity (ε0) : 8.85 × 10−12 C2/(N·m2)
Item Proton Neutron Electron
Mass 1 1 Negligible
Charge +1 0 -1
Spin   

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