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Physical constant

Proton Mass

The rest mass of a proton.

m_p = 1.672621×10⁻²⁷ kg

Other constants

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