according to the 2nd law of thermodynamics, as time has increase, disorder universally is increasing among the interaction of particles , eventually reaching thermo-equibrium. As you probably know from experience, when you fill a tub with hot water, it doesn't take very long for the tub to become cold. What I don't understand is , if a tub is filled with cold water, then why doesn't it become hotter as time passes bye? The hotter a system is, the higher the amount of disorder within that system. Of course if you leave a cold bottle of water inside a car for a certain amount of time, its no longer worth drinking after a 5 mile jog around the neighborhood. Why isn't the second law thermodynamics consistent for both systems?