Fundamental Physical Constants - Basics

                                     

Fundamental Physical Constants


ConstantSymbolValue
acceleration due to gravityg9.8 m s-2
atomic mass unitamu, mu or u1.66 x10-27 kg
Avogadro's NumberN6.022 x 1023 mol-1
Bohr radiusa00.529 x 10-10 m
Boltzmann constantk1.38 x 10-23 J K-1
electron charge to mass ratio-e/me-1.7588 x 1011 C kg-1
electron classical radiusre2.818 x 10-15 m
electron mass energy (J)mec28.187 x 10-14 J
electron mass energy (MeV)mec20.511 MeV
electron rest massme9.109 x 10-31 kg
Faraday constantF9.649 x 104 C mol-1
fine-structure constantα7.297 x 10-3
gas constantR8.314 J mol-1 K-1
gravitational constantG6.67 x 10-11 Nm2kg-2
neutron mass energy (J)mnc21.505 x 10-10 J
neutron mass energy (MeV)mnc2939.565 MeV
neutron rest massmn1.675 x 10-27 kg
neutron-electron mass ratiomn/me1838.68
neutron-proton mass ratiomn/mp1.0014
permeability of a vacuumμ04π x 10-7 N A-2
permittivity of a vacuumε08.854 x 10-12 F m-1
Planck constanth6.626 x 10-34 J s
proton mass energy (J)mpc21.503 x 10-10 J
proton mass energy (MeV)mpc2938.272 MeV
proton rest massmp1.6726 x 10-27 kg
proton-electron mass ratiomp/me1836.15
Rydberg constantr1.0974 x 107 m-1
speed of light in vacuumC2.9979 x 108 m/s