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Physical constant

Speed of Light

The speed of light in vacuum — the universe's ultimate speed limit.

c = 299,792,458 m/s

Other constants

Gravitational Constant Planck Constant Reduced Planck Constant Elementary Charge Boltzmann Constant Avogadro Constant Gas Constant Vacuum Permittivity Vacuum Permeability Electron Mass Proton Mass Stefan–Boltzmann Constant