Comportamenti casuali di un sistema deterministico

After some brief remarks about determinism and randomness, a simulation program is illustrated which points out how chance and necessity do coexist in classical physics. Actually, a gas of N = 1000 interacting disks in a box neatly head for the Maxwell-Boltzmann distribution just in some ten collisions. Several didactical remarks are produced and some quantitative features are checked out as well.