Entropy is related to the energy distribution of energy states of a collection of molecules, and this aspect is usually discussed in statistical mechanics. Traditionally, the entropy concept is associated with the second and third laws of thermodynamics. These changes cause an increase in entropy for the system under consideration, but energy is not transferred into or out of the system. A different concept is required to explain spontaneous changes such as the expansion of a gas into an abailable empty space (vacumm) and heat transfer from a hot body into a cold body. Human experienced chemical and physical changes that cannot be explained by energy alone. This concept was developed over a long period of time. Entropy, symbol S, is related to energy, but it a different aspect of energy. We have define energy as the driving force for changes, entropy is also a driving force for physical and chemical changes (reactions). We confine our discussion to thermodynamics (science dealing with heat and changes) and to chemical and physical processes. The word entropy is used in many other places and for many other aspects. You are not alone if you have some difficulty with this concept. Thus, few people understand what entropy really is. \)Įntropy is a chemical concept that is very difficult to explain, because a one-sentence definition will not lead to a comprehensive statement.
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