Frozen water , I hear you say. O , you say. The same molecules, just in a different order. It turns out that the molecules in water are not entirely disordered. Some gang up in small groups as the temperature is lowered below 4 o C - but this is outside my realm.
Ice is unusual, because the molecules in ice are actually further apart than they are in water.
One consequence of this is that ice floats on water, which helps to keep lakes from freezing solid in the winter - so the fish are happy with this arrangement. Phase Change Nature always does the most likely thing. There is a principle known as the ergodic assumption , which in essence states that all configurations of molecules are equally likely, molecule by molecule . That sounds wrong , you say. If that were true, then it would be just as likely that all the molecules go to the next room as stay evenly distributed.