2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/106610We report that liquids perform self-propelled motion when they are placed in contact with hot surfaces with asymmetric (ratchet-like) topology. The pumping effect is observed when the liquid is in the film-boiling regime, for many liquids and over a wide temperature range. We propose that liquid motion is driven by a viscous force exerted by vapor flow between the solid and the liquid.Fluid DynamicsSoft Condensed Mattertext