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- Entropy abstract "In thermodynamics, entropy (usual symbol S) is a measure of the number of specific ways in which a thermodynamic system may be arranged, often taken to be a measure of disorder, or a measure of progressing towards thermodynamic equilibrium. The entropy of an isolated system never decreases, because isolated systems spontaneously evolve towards thermodynamic equilibrium, the maximum entropy. Systems which are not isolated may decrease in entropy. Since entropy is a state function, the change in the entropy of a system is the same for any process going from a given initial state to a given final state, whether the process is reversible or irreversible. However irreversible processes increase the combined entropy of the system and its environment.The change in entropy (ΔS) was originally defined for a thermodynamically reversible process as,which is found from the uniform thermodynamic temperature (T) of a closed system dividing an incremental reversible transfer of heat into that system (dQ). The above definition is sometimes called the macroscopic definition of entropy because it can be used without regard to any microscopic picture of the contents of a system. In thermodynamics, entropy has been found to be more generally useful and it has several other formulations. Entropy was discovered when it was noticed to be a quantity that behaves as a function of state, as a consequence of the second law of thermodynamics. Entropy is an extensive property, but the entropy of a pure substance is usually given as an intensive property — either specific entropy (entropy per unit mass) or molar entropy (entropy per mole).The absolute entropy (S rather than ΔS) was defined later, using either statistical mechanics or the third law of thermodynamics.In the modern microscopic interpretation of entropy in statistical mechanics, entropy is the amount of additional information needed to specify the exact physical state of a system, given its thermodynamic specification. Understanding the role of thermodynamic entropy in various processes requires understanding how and why that information changes as the system evolves from its initial condition. It is often said that entropy is an expression of the disorder, or randomness of a system, or of our lack of information about it. The second law is now often seen as an expression of the fundamental postulate of statistical mechanics via the modern definition of entropy. Entropy has the dimension of energy divided by temperature, which has a unit of joules per kelvin (J/K) in the International System of Units.".
- Entropy thumbnail Clausius.jpg?width=300.
- Entropy wikiPageExternalLink entropysite.oxy.edu.
- Entropy wikiPageExternalLink lecture-9-entropy-and-the-clausius-inequality.
- Entropy wikiPageExternalLink lecture-24.
- Entropy wikiPageExternalLink entropy-a-basic-understanding.asp.
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- Entropy wikiPageID "9891".
- Entropy wikiPageRevisionID "606030262".
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- Entropy quote "Any method involving the notion of entropy, the very existence of which depends on the second law of thermodynamics, will doubtless seem to many far-fetched, and may repel beginners as obscure and difficult of comprehension.".
- Entropy quote "I thought of calling it 'information', but the word was overly used, so I decided to call it 'uncertainty'. [...] Von Neumann told me, 'You should call it entropy, for two reasons. In the first place your uncertainty function has been used in statistical mechanics under that name, so it already has a name. In the second place, and more important, nobody knows what entropy really is, so in a debate you will always have the advantage.'".
- Entropy source "Conversation between Claude Shannon and John von Neumann regarding what name to give to the attenuation in phone-line signals".
- Entropy source "Willard Gibbs, Graphical Methods in the Thermodynamics of Fluids".
- Entropy width "30".
- Entropy subject Category:Concepts_in_physics.
- Entropy subject Category:Entropy.
- Entropy subject Category:Philosophy_of_thermal_and_statistical_physics.
- Entropy subject Category:State_functions.
- Entropy comment "In thermodynamics, entropy (usual symbol S) is a measure of the number of specific ways in which a thermodynamic system may be arranged, often taken to be a measure of disorder, or a measure of progressing towards thermodynamic equilibrium. The entropy of an isolated system never decreases, because isolated systems spontaneously evolve towards thermodynamic equilibrium, the maximum entropy. Systems which are not isolated may decrease in entropy.".
- Entropy label "Entropia".
- Entropy label "Entropia".
- Entropy label "Entropia".
- Entropy label "Entropie (Thermodynamik)".
- Entropy label "Entropie (thermodynamique)".
- Entropy label "Entropie".
- Entropy label "Entropy".
- Entropy label "Entropía".
- Entropy label "Энтропия".
- Entropy label "إنتروبيا".
- Entropy label "エントロピー".
- Entropy label "熵".
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- Entropy wasDerivedFrom Entropy?oldid=606030262.
- Entropy depiction Clausius.jpg.
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