Planck Base Units

Key References:

“All the systems of units which have hitherto been employed owe their origin to the coincidence of accidental circumstances, inasmuch as the choice of the units lying at the base of every system has been made, not according to general points of view, but essentially with reference to the special needs of our terrestrial civilization. . . In contrast with this it might be of interest to note that we have the means of establishing units which are independent of special bodies or substances. The means of determining the units of length, mass, and time are given by the action constant h, together with the magnitude of the velocity of propagation of light in a vacuum c, and that of the constant of gravitation G. These quantities must be found always the same, when measured by the most widely differing intelligences according to the most widely differing methods.” – Max Planck, The Theory of Heat Radiation, 1906

Fundamental constants (CERN). There exist the following universal constants in nature:
•G (gravitational constant)
•c (velocity of light in a vacuum)
•h (Planck’s quantum of action)
•ε0 (electric field constant of a vacuum)
•k (Boltzmann constant)