Example image of eyePlorer eyePlorer map for 'Physical constant': Physical quantity Mathematical constant Speed of light Nondimensionalization Physical law Dimensionless physical constant Dimensionless quantity Fine-structure constant Gravitational constant National Institute of Standards and Technology Elementary particle Anthropic principle Paul Dirac John D. Barrow Fine-tuned Universe Planck units Quantum gravity Astronomical constant Bohr magneton Boltzmann constant Carter constant Einstein's constant Gas constant Impedance of free space List of scientific constants named after people Molar mass constant Multiverse Nuclear magneton Planck constant Proton magnetogyric ratio Rydberg constant Stefan–Boltzmann constant Universe Variable speed of light Barlow's law Electron rest mass Elementary charge Geometrized unit system Johannes Rydberg List of materials properties Nuclear energy Stoney scale units Measurement uncertainty Atomic units Cherenkov radiation Committee on Data for Science and Technology KCalc Magnetic susceptibility Reviews of Modern Physics Anthropic units