Furthermore, it includes the entropy of the system and the entropy of the surroundings.īesides, there are many equations to calculate entropy:ġ. Thus, from equation (2), we conclude that the change of entropy in a reversible process is equal to Q/T which is the mathematical formulation of the second. Also, scientists have concluded that in a spontaneous process the entropy of process must increase. Moreover, the entropy of solid (particle are closely packed) is more in comparison to the gas (particles are free to move). Entropy FormulaĮntropy is a thermodynamic function that we use to measure uncertainty or disorder of a system. In addition, some microscope process is reversible. Besides, some other example of changeable phase is the melting of metals. It can be linked to the law of conservation of energy. The first law of thermodynamics provides the definition of the internal energy of a thermodynamic system, and expresses its change for a closed system in terms of work and heat. On the other hand, blowing a building, frying an egg is an unalterable change. Introduction Heat flowing from hot water to cold water. Moreover, when the process is unalterable then the entropy will increase.įor example, watching a movie is a changeable process because you can watch the movie from backward. Also, even when the cyclic process is changeable then the entropy will not change. The second law of thermodynamics says that every process involves a cycle and the entropy of the system will either stay the same or increase. Get the huge list of Physics Formulas here The Second Law of Thermodynamics Furthermore, the more you increase the ball the more ways it can be arranged. So, now you can arrange the balls in two ways. After some time you put another ball on the table. Moreover, the question here is in how many ways you can arrange this ball? The answer is one. In another example, you grab a ball and put it on a table. So, what will happen next? We all know that the smell will spread in the entire room and the perfume molecule will eventually fill the room. Suppose you sprayed perfume in one corner of the room. Assume that there are two heat reservoirs R1 and R2 at temperatures T1. This equation effectively gives an alternate definition of temperature that agrees with the usual definition. Furthermore, we can understand it more easily with the help of an example. By the Clausius definition, if an amount of heat Q flows into a large heat reservoir at temperature T above absolute zero, then the entropy increase is S Q / T. Moreover, the higher the entropy the more disordered the system will become. Entropy refers to the number of ways in which a system can be arranged.
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