disgregationIce melting
Two depictions of Ice melting, molecular and visual, described in 1862 by Rudolf Clausius as an increase in the disgregation of the water molecules in ice, a precursor to the later order-disorder views of entropy. [2]
In thermodynamics, disgregation, as contrasted with aggregation, refers to entropy being a measure of the separation distance of the particles of a system. Disgregation is the alternative definition of entropy, introduced by German physicist Rudolf Clausius in 1862, introduced to mean that entropy can be thought of as the "arrangement of the body" or ordering of the constituent particles of the body. [1]

1. (a) Clausius, Rudolf. (1862). "On the Application of the Theorem of the Equivalence of Transformations to Interior Work." Communicated to the Naturforschende Gesellschaft of Zurich, Jan. 27th, 1862; published in the Viertaljahrschrift of this Society, vol. vii. P. 48; in Poggendorff’s Annalen, May 1862, vol. cxvi. p. 73; in the Philosophical Magazine, S. 4. vol. xxiv. pp. 81, 201; and in the Journal des Mathematiques of Paris, S. 2. vol. vii. P. 209;
(b) Clausius, R. (1865). The Mechanical Theory of Heat – with its Applications to the Steam Engine and to Physical Properties of Bodies (Sixth Memoir, pgs. 215-66). London: John van Voorst, 1 Paternoster Row. MDCCCLXVII.
2. Williams, R.J.P. and da Silva, J.R.R. Frausto. (2008). The Chemistry of Evolution: the Development of our Ecosystem (pg. 80). Elsevier.

Further reading
● Pellegrino, Emilio M., Ghibaudi, Elena, and Cerruti, Luigi. (2015). “Clausius’ Disgregation: a Conceptual Relic that Sheds Light on the Second Law” (abs), Entropy, 17(7):4500-18.

External links
Disgregation – Wikipedia.

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