2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/1378Using a simple criterion proposed by Kirzhnitz,we have discussed the plasma-solid transition in two simple model cases: the Fermi-Dirac and Bose Einstein gas.Some possibilities of astrophysical applications of our results are also indicated.plain LaTeX,no figures.Accepted for the 20th SPIG,to be held in Zlatibor,Yugoslavia,4-8 September 2000Astrophysicstext