2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/26478An adiabatic piston, separating two granular gases prepared in the same macroscopic state, is found to eventually collapse to one of the sides. This new instability is explained by a simple macroscopic theory which is furthermore in qualitative agreement with hard disk molecular dynamics.7 pages, 5 figuresStatistical Mechanicstext