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Physical constants

Bohr magneton
Unit of magnetic moment
Bohr radius
Physical constant; the most probable distance between an electron and the nucleus in a nonrelativistic model of the hydrogen atom with infinitely heavy nucleus
Boltzmann constant
Physical constant relating particle kinetic energy with temperature
Electron magnetic moment
Spin of an electron
Elementary charge
Charge carried by one proton or electron
Fine-structure constant
Dimensionless number that quantifies the strength of the electromagnetic interaction
Gravitational constant
Physical constant relating the gravitational force between objects to their mass and distance
Physical constant
Universal and unchanging physical quantity
Planck constant
Physical constant in quantum mechanics
Speed of light
Speed at which all massless particles and associated fields travel in vacuum
Vacuum permeability
Physical constant
Vacuum permittivity
Absolute dielectric permittivity of vacuum