2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/87865Starting from the knowledge of the four fundamental quantities length L, mass M, time T, absolute temperature $θ$ and accepting the validity of Gauss's law in all dimensions, we generalize, by the theory of physical dimensions, the expression of the Stephan-Boltzmann law and of the Planck's formula for the black-body radiation to a spacetime with one time and n spatial coordinates. In the particular case n=3 we shall recover the known results.16 pages, Latex2e, no figuresGeneral Physicstext