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Physical constant

Boltzmann Constant

Links temperature to energy at the particle scale.

k_B = 1.380649×10⁻²³ J/K

Other constants

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