2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/194397It is shown that small elements of perfect fluid in adiabatic processes move along geodesic lines of a Riemannian space-time.5 pages, Latex. Final versionGeneral Relativity and Quantum CosmologyAstrophysicsMathematical PhysicsFluid DynamicsHydrodynamic Flow as Congruence of Geodesic Lines in Riemannian Space-Timetext