Fundamental Constants Registry

Speed of Light Planck Constant Reduced Planck Constant Gravitational Constant Elementary Charge Boltzmann Constant Avogadro Constant Fine-Structure Constant Electron Mass Proton Mass Neutron Mass Rydberg Constant Bohr Radius Vacuum Permittivity Vacuum Permeability Molar Gas Constant Stefan-Boltzmann Constant Faraday Constant Atomic Mass Constant Bohr Magneton Compton Wavelength Classical Electron Radius Standard Gravity Wien Displacement Constant Alpha Particle Mass Atomic Mass Constant Energy Characteristic Impedance of Vacuum Conductance Quantum Deuteron Mass Energy Electron Mass Energy Electron Volt First Radiation Constant Hartree Energy Helion Mass Energy Inverse Fine-Structure Constant Josephson Constant Loschmidt Constant Magnetic Flux Quantum Molar Planck Constant Molar Volume of an Ideal Gas Muon Mass Energy Neutron Mass Energy Nuclear Magneton Planck Length Planck Mass Planck Temperature Planck Time Proton–Electron Mass Ratio Proton Mass Energy Quantum of Circulation Rydberg Constant × hc Sackur–Tetrode Constant Second Radiation Constant Thomson Cross Section Triton Mass Energy Von Klitzing Constant Weak Mixing Angle

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