Bohr radius                   ao, bohr  5.29167~7E-11 m          
speed of light in vacuum      c         2.997925~3E8 m/s         
elementary charge             e         1.60210~7E-19 C          
electron-volt                 eV        1.60210~7E-19 J          
Faraday's constant            F         9.64870~16E4 C/mol       
gravitational constant        G         6.670~15 E-11 N.m^2/kg^2 
Planck's constant             h         6.6256~5E-34 J.s         
Boltzmann's constant          k         1.38054~18E-23 J/K       
electron rest mass            me        9.1091~4E-31 kg          
neutron rest mass             mn        1.67482~8E-27 kg         
proton rest mass              mp        1.67252~8E-27 kg         
Avogadro's number             N         6.02252~28E+23 /mol      
gas constant                  R         0.08206~ L.atm/K.mol     
gas constant, S.I.U.          Rsi       8.3143~12 J/K.mol        
Rydberg constant              Ry        1.0973731~3E7 /m         
atomic mass unit              u         1.66056~E-27 kg