`  ==Correction of error ==  In Talk:Entropy of 23:26, 25 October, Bduke, a distinguished physical chemist and Wikipedia contributor and editor, erred seriously in two points. Quoting him (with my insertions of numbers), “[1] Maybe Frank Lambert's approach will spread, [2] but have a look at  Atkins, ``Physical Chemistry``, 8th edition, where it has spread somewhat but the terms disorder and, I think chaos, are still used.”    :In early October Bduke was not active in Talk:Entropy and thus undoubtedly was unaware of http://en.wikipedia.org/wiki/Talk:Entropy#Non-notable.3F of 9 October. Therein, his point  [1], a questioning of the spread of an approach to entropy as the measure of the dispersal of energy/T in a process, is conclusively countered.  That the majority of new editions of established US chemistry textbooks have adopted it within just three years of the publication of his principal articles is nothing less than astonishing support for the approach. Sales figures are guarded by publishers, but it is more probable than not that the majority of chemistry students in the US since Fall 2005 have been taught this approach.   :Thus, the approach has already spread remarkably widely.  It is not an individual’s POV. (Of course it may take a generation to reach all scientists and science texts. That is the common history of new concepts, is it not?  But this approach already has been proved to have legs!)   Bduke’s second point [2] is a grave error perhaps because he just received his copy of Atkins’ “Physical Chemistry”, 8th edition and has had time only to scan it rapidly.  My gift copy came in March and I know its comments re entropy well, especially in comparison to previous editions. The change is not “somewhat” but profound and thorough.  :In prior editions (with his italics in the following quotes) , Atkins defined spontaneous changes as “accompanied by a dispersal of energy into a more disordered form.”  The direction of change, he wrote, is one “that leads to the greater chaotic dispersal of the total energy…”  “The spreading of the object’s energy into the surroundings as thermal motion is a natural consequence of chaos.”  “[The thermodynamic definition of entropy] is motivated by the idea that a change in the extent to which energy is dispersed chaotically can be derived by noting the quantity of energy that is transferred as heat…” [sic].  “The definition of a spontaneous change and its interpretation [is] in terms of the tendency of an isolated system to achieve greater disorder.”  There are some 27 uses of the words ‘order’ and ‘disorder’ in discussing particular applications of entropy change.  :The foregoing is certainly an emphasis on disorder and chaos in interpreting entropy, even when the dispersal of energy is associated with entropy change.  Contrast this to the 8th edition with its numerous clear statements about entropy, entropy change, and the dispersal of energy, never using ‘disorder’ in connection with a definition of entropy.  (The word ‘chaos’ does not appear in the Second Law chapter.  I visually checked and computer word-searched. The words ‘order’ or ‘disorderly’ appear a total of 4 times.)  ::p. 77: “Can it be…that the direction of change is related to the distribution of energy?...this idea is the key…spontaneous changes are always accompanied by a dispersal of energy.” “…the signpost of spontaneous change: we look for the direction of change that leads to dispersal of the total energy of the isolated system.”  p. 78: “…in due course, we shall see that dispersal of energy and matter accounts for change…” “We shall see that the entropy…is a measure of the energy dispersed in a process…”The thermodynamic definition of entropy …is motivated by the idea that a change in the extent to which energy is dispersed depends on how much energy is transferred as heat.”   ::p. 81 “The concept of the number of microstates makes quantitative the ill-defined qualitative concepts of ‘disorder’ and ‘dispersal of matter and energy’ that are used widely to introduce the concept of entropy” Note: This quote appears to put ‘disorder’ on an equal footing with the qualitative ‘dispersal of matter and energy’.  However, Atkins consistently uses ‘dispersal of energy’ or of ‘energy and matter’ in his qualitative definitions of entropy change whereas he has discarded that use of ‘disorder’ in defining entropy here in this edition.  p. 88: “[re phase change] This decrease in entropy is consistent with localization of matter and energy that accompanies the formation of a solid from a liquid  or a liquid from a gas….If the transition is endothermic [as in melting, vaporization] the entropy change is positive, which is consistent with dispersal of energy and matter in the system.”  p. 89:  “…Trouton’s rule …strong molecular interaction…As a result there is a greate