====== Irreversible Mixing Marbles ====== {{:physicsdemos:thermodynamics_and_fluid_dynamics:statistical_mechanics:irreversible_mixing_marbles.jpeg?400|}} Two groups of marbles of different color are separated by a partition in a tray. When the partition is removed and the tray is shaken, the marbles become irreversibly mixed. P1 PIRA DCS 4F10.20