2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/145984Near the critical point, isothermal interfacial zones are investigated starting from a non-local density of energy. From the equations of motion of thermocapillary fluids, we point out a new kind of adiabatic waves propagating along the interfacial layers. The waves are associated with the second derivatives of densities and propagate with a celerity depending on the proximity of the critical point.12 pagesFluid DynamicsOther Condensed MatterMathematical Physicstext