Avogadro constant
Boltzmann constant
Electron mass
Electron volt
Electronic charge
Faraday constant
Gravitational constant
Neutron mass
Permeability of free space
Permittivity of free space
Planck constant
Proton mass
Proton-electron mass ratio
Speed of light
Universal gas constant
Particle physics:
Class | Name | Symbol | Mass | Mean life | Year of discovery |
Leptons | Electron Neutrino Muon Tau | 1 207 3500 | Stable Stable | 1897 1957 1937 1975 | |
Mesons | Pi meson K meson | 273 264 ≈970 | ? | 1947 1947 1947 | |
Baryons | Proton Neutron Lambda Sigma Chi omega | 1836 1839 2183 2327 2573 3272 | 1897 1932 1947 1953 1954 1964 |