 Welcome back, before we compare the three interesting adjectives, let us define one more term which will be useful in that comparison and that term is entropy produced or entropy production. You may have heard or you may have read in some textbooks that entropy is always produced, it is never destroyed. So what is that entropy production one talks about, let us define it properly. See the second law and the definition of entropy tells us that ds, the change in entropy is always greater than or at most equal to d cube by t. I am considering a small process element. Let us transpose the right hand side term to the left hand side and we will get ds minus d cube by t to be greater than or equal to 0. That means the left side of this, well I cannot call it equation, this relation is always positive, it is never negative. It is positive in the limit, it can be 0 in the reversible limit, but it can never be negative. This is the term which we can define as the entropy produced. Since we are in the differential domain, we will call it dsp and hence our definition is esp is defined as ds minus d cube by t. Now this is the defining expression for the entropy produced. This is the name entropy produced and the second law now gets hidden in this and hence if you want to properly write second law in terms of dsp, this definition it becomes dsp must be greater than or equal to 0. This becomes the second law. On the other hand if you have a process, then for a process we can write delta s must be greater than or equal to integral of d cube by t and in a similar fashion you can write sp as delta s minus integral d cube by t. This will be the definition of entropy produced for a full process and the second law would be this entropy produced must be greater than or equal to 0. This is the second law. We will write this expression as ds equal to d cube by t plus dsp or we can write this expression as delta s is integral d cube by t plus sp. We will use these expressions for comparison of the adjectives. One thing before we go is to notice that d cube for a general process which is considered here is not an exact differential and hence when you integrate d cube we do not get delta cube. We simply get cube the heat interaction. Similarly our dsp the differential of entropy produced is not an exact differential. So when you integrate that over a process you just get the entropy produced in that process not delta sp simply dsp. Thank you.