Assume I got a box full with four particals two of them cold and two other hot. This system got entropy s0 Now I got a button that in activation divides the box to two boxes. I push it without even look at my system And I can get a situation where the cooler particals in one side and hotter in other. There's a large chance for that to happen. So if I understand right, Entropy now decrees? So, I don't understand entropy? or the law of Thermodynamics only applies on large particals system?