Philosophy Dictionary of ArgumentsHome
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| Entropy: Entropy in physics is a measure of the disorder of a system. It is a thermodynamic quantity that is denoted by the letter S and has units of joules per kelvin (J/K). Entropy is often described as a measure of the number of possible microscopic configurations of a system that are consistent with its macroscopic state. The higher the entropy of a system, the more disordered it is. See also Time reversal, Time, Symmetries, Asymmetry._____________Annotation: The above characterizations of concepts are neither definitions nor exhausting presentations of problems related to them. Instead, they are intended to give a short introduction to the contributions below. – Lexicon of Arguments. | |||
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Bernulf Kanitscheider on Entropy - Dictionary of Arguments
I 256/257 Entropy/Universe/Kanitscheider: the photons of the background radiation supply the lion's share to the entropy of the universe. All photons produced later by stars during nuclear fusion are vanishing in comparison. Now the number of photons forms a measure for the entropy of the universe. And this is because they are the least ordered state of the thermal energy of a system, because here the number of possible states is the largest, while the nucleons represent a correspondingly larger type of order, because of fewer possible combinations. This is not affected by the pure expansion itself! (The expansion is adiabatic and therefore isentropic (sic)). Because of the small entropy production of the stars the entropy of the universe remains nearly constant. The high specific entropy of the universe (the number of photons per baryon) s = N(γ)/N(b) +108 already existed at the time of plasma recombination or at the transition from the radiation-dominated to the matter-dominated era. This suggests weighty dissipative smoothing processes in the early time. But even this leads to a much too high value, if one assumes an initial chaotic state. The actual value demands that the universe 10 35 sec after the big bang was already homogeneous. I 257/58 If one lets a space-like hypersurface intersect by our past light cone and considers the individual events on this hypersurface, then it can be asserted on the basis of the above connections that all events presumably possess a singularity in their past, because the high degree of homogeneity at early times conditions the convergence of the time-like geodesics directed from these event points. >Universe/Kanitscheider, >Space-Time/Kanitscheider._____________Explanation of symbols: Roman numerals indicate the source, arabic numerals indicate the page number. The corresponding books are indicated on the right hand side. ((s)…): Comment by the sender of the contribution. Translations: Dictionary of Arguments The note [Concept/Author], [Author1]Vs[Author2] or [Author]Vs[term] resp. "problem:"/"solution:", "old:"/"new:" and "thesis:" is an addition from the Dictionary of Arguments. If a German edition is specified, the page numbers refer to this edition. |
Kanitsch I B. Kanitscheider Kosmologie Stuttgart 1991 Kanitsch II B. Kanitscheider Im Innern der Natur Darmstadt 1996 |
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> Counter arguments against Kanitscheider
> Counter arguments in relation to Entropy
Ed. Martin Schulz, access date 2024-04-25