What Is the 2nd Law of Thermodynamics?

Answer

The second law of thermodynamics states that in a system, a process that occurs will tend to increase the total entropy of the universe. Thus, while a system can go through some physical process that decreases its own entropy, the entropy of the universe must increase overall. Processes that decrease the total entropy of the universe are impossible. If a system is at equilibrium, by definition no spontaneous processes occur, and therefore the system is at maximum entropy.
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