Where $\Omega$ is the number of accessible micro-states (link to a video). However, one has to ask, how we measure the "usability" of energy. Is as well a restatement of the upper definition. By doing the calculation we find, that the disorder increases, if heat is transferred from the warm to the cold and that the heat transfer stops in thermal equilibrium. Is a consequence of the definition given above (the idea is presented below). However, none physicists often mistake increasing with strictly increasing.Īs entropy is linked to disorder by the law of Statistical Physics (see below), the first statement of yours Therefore, in the second law "never decreases with time" is often replaced by "always increases with time". Therefore, the entropy does not have to strictly increase with time. It's possible to have a process which keeps the total entropy constant.Hence the words total (entropy), and isolated (system) are important. However, the entropy of the complete system is increased, by transferring heat from the colder to the warmer place. Here we decrease the temperature locally (=inside the refrigerator), which leads to a local decrease in entropy. You can decrease the entropy locally, but not globally: E.g.There are a couple of details in this sentence, which are worth pointing out: The second law of thermodynamics states, that the total entropy of an isolated system never decreases with time. I have just started understanding this topic.An answer without maths and one which gives conceptual clarity would be appreciated. The third definition made the most sense to me but since it is a law,can it actually be proven or is it just accepted because of experimental evidence?Can human find ways to utilize this unusable energy in an efficient way and still not increase the entropy of the system? And what does "unusable" energy mean?Aren't usable and unusable energy only significant for humans?Why does the universe even care if energy can be used or not? In the first one,what is really meant by disorder? What is the true meaning of disorder? Does disorder depend upon the observation of a conscious mind, or does it have a meaning even without an observer?Īlso, are all these three definitions actually interconnected? Unusable energy of a system always increases. Heat always flows from a hot to a cold object I started reading about entropy and the second law of thermodynamics.ĭifferent sites give different definitions and meanings of this law.
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