2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/22429We discuss peculiar aspects of the first law of thermodynamics for systems characterized by the presence of meta-equilibrium quasi-stationary states for which the pertinent phase/configuration spaces is generally inhomogeneous. As a consequence, the naive additivity requirement for thermodynamic quantities ceases to be satisfied.20 pages, no figuresStatistical Mechanicstext