2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/16725We study dissipation in a dilute Bose gas induced by the motion of a macroscopic object. A blue-detuned laser beam focused on the center of a trapped gas of sodium atoms was scanned both above and below the BEC transition temperature. The measurements allow for a comparison between the heating rates for the superfluid and normal gas.11 pages, submitted to Journal of Low Temperature PhysicsSoft Condensed Mattertext