2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/155624We analyze the physical meaning of fluctuations of the phase space contraction rate, that we also call entropy creation rate, and its observability in space-time intermittency phenomena. For concreteness we consider a Navier-Stokes fluid.10 pages, plain TeXChaotic DynamicsStatistical MechanicsFluid DynamicsFluctuations and entropy driven space-time intermittency in Navier-Stokes fluidstext