The Planck units are a system of units based on five fundamental constants, named after their inventor Max Planck: * The speed of light in a vacuum c, which is equal to exactly 299792458 meters per second * The gravitational constant G, approximately equal to \(6.67408 imes 10^{-11}\) meters cubed per kilogram per second squared * The reduced Planck constant ħ, approximately equal to \(1.05457 imes 10^{-34}\) joule-seconds * The Coulomb constant ke, approximately equal to \(8.98755 imes 10^9\) meters per farad * The Boltzmann constant kB, approximately equal to \(1.380649 imes 10^{-23}\) joules per kelvin