2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/142661This draft (in preparation) has been withdrawn so as to be combined with its second part (work also in preparation), to produce a single paper, that includes further analysis and revisions done after new important results obtained.This paper has been withdrawnAstrophysicsA 3D Study of Combined Density and Temperature Fluctuations in Gaseous Nebulae I: Theorytext