2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/105291We present a quasi-two dimensional model of flowing soap films that bears striking similarity to the compressible Navier-Stokes equations. The variation in soap film thickness that is commonly used for flow visualization in experiments is analogous to density variations in the Navier-Stokes equations. When the soap film flow velocity is comparable to the Marangoni elastic wave velocity we recover the compressible Navier-Stokes equations and the soap film behaves like a two-dimensional isothermal viscous gas.Submitted to Physics of Fluids. Total of 8 pages: 2 page cover, 4 pages of text, and a 2 page supplement. No figuresFluid Dynamicstext