2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/4357A few results that indicate the presence of temperature variations in gaseous nebulae are reviewed. The evidence is based on: a) temperatures derived from different methods, and b) on comparisons of abundances predicted by models of galactic chemical evolution with abundances derived from observations.6 pages, proceedings of the 10th IAU latinamerican regional reunionAstrophysicstext