2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/143128We review the evidence for a constant star formation rate per unit mass in dense molecular gas in the Milky Way and the extragalactic correlations of L_IR with L' from observations of dense molecular gas. We discuss the connection between the constant SFR/M interpretation in dense gas and the global Schmidt-Kennicutt star formation law.7 pages. To appear in Massive Star Formation: Observations Confront Theory, ed. H. Beuther, ASP Conference SeriesAstrophysicstext