How small does your rice pudding need to get when stirring jam into it?

(Springer) Have you ever tried turning the spoon back after stirring jam into a rice pudding? It never brings the jam back into the spoon. This ever-increasing disorder is linked to the notion of entropy. In a study published in EPJ Plus, Loris Ferrari from the University of Bologna, Italy, demystifies the clash between two theories of entropy by analysing the practical consequences in two well-defined size systems, with a view to confirming them experimentally.