Entropy decrease

In thermodynamics, entropy decrease, as contrasted with entropy increase, refers generally to a process in which entropy was removed from a body.

Overview
The term “entropy decrease”, according to the Helmholtz-Planck-Nernst-Boltzmann model of entropy, tends to equate, in the mind of many, the premise that the “order” of the body has increased. To exemplify, German physicist Hermann Helmholtz, in his 1882 “On the Thermodynamics of Chemical Processes”, defined the magnitude of entropy |S| as the measure of atomic-molecular disorganization. [1] In this sense, many extrapolate the generalized notion that entropy decrease correlates to a decrease in atomic-molecular disorganization in the given body or system.

There is, however, much fine print to this assertion. When isothermal-isobaric state reaction-formed chemical species, are quantified in a given state of existence, on a thermodynamic database table (free energy table), the free energy become the measure of importance, entropy reconciled to a second place position. A so-called entropy-enthalpy compensation becomes a factor, which is step above the older gas theory based models of the magnitude of entropy = magnitude of disorder of system.

Local entropy decrease
During the course of the century plus long schism between evolution theory and the second law mandate of entropy always tending to a maximum, someone (add) proposed the notion that ordered structures form, within the confines of the overarching governance of the second law, as types of “local entropy decrease” structures, at the expense of the increase in the entropy in the surroundings. This catch phrase has been repeated ad nauseam ever since as the so-called solution to the second law (disordering) evolution (ordering) paradox.

References
1. (a) Helmholtz, Hermann. (1882). “On the Thermodynamics of Chemical Processes”, in: Physical Memoirs Selected and Translated from Foreign Sources, 1: 43-97. Physical Society of London, Taylor and Francis, 1888.
(b) Koenigsberger, Leo. (1902). Hermann von Helmholtz ("The Thermodynamics of Chemical Processes", pgs. 335-39; 1883: Note on an Introduction to Thermodynamics, pgs 340-43) trans. Frances A. Welby, preface by Lord Kelvin. Oxford at the Clarendon Press.

External links
‚óŹ Entropy decrease – PhysicsForums.com.

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