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Xu, H. Thermodynamics and an Introduction to Thermostatistics. Encyclopedia. Available online: https://encyclopedia.pub/entry/35726 (accessed on 30 November 2023).

Xu H. Thermodynamics and an Introduction to Thermostatistics. Encyclopedia. Available at: https://encyclopedia.pub/entry/35726. Accessed November 30, 2023.

Xu, Handwiki. "Thermodynamics and an Introduction to Thermostatistics" *Encyclopedia*, https://encyclopedia.pub/entry/35726 (accessed November 30, 2023).

Xu, H.(2022, November 22). Thermodynamics and an Introduction to Thermostatistics. In *Encyclopedia*. https://encyclopedia.pub/entry/35726

Xu, Handwiki. "Thermodynamics and an Introduction to Thermostatistics." *Encyclopedia*. Web. 22 November, 2022.

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Thermodynamics and an Introduction to Thermostatistics is a textbook written by Herbert Callen that explains the basics of classical thermodynamics and discusses advanced topics in both classical and quantum frameworks. The textbook contains three parts, each building upon the previous. The first edition was published in 1960 and a second followed in 1985.

classical thermodynamics
thermostatistics
thermodynamics

The first part of the book starts by presenting the problem thermodynamics is trying to solve, and provides the postulates on which thermodynamics is founded. It then develops upon this foundation to discuss reversible processes, heat engines, thermodynamics potentials, Maxwell's relations, stability of thermodynamics systems, and first-order phase transitions. As the author lays down the basics of thermodynamics, he then goes to discuss more advanced topics such as critical phenomena and irreversible processes.

The second part of the text presents the foundations of classical statistical mechanics. The concept of Boltzmann's entropy is introduced and used to describe the Einstein model, the two-state system, and the polymer model. Afterwards, the different statistical ensembles are discussed from which the thermodynamics potentials are derived. Quantum fluids and fluctuations are also discussed.

The last part of the text is a brief discussion on symmetry and the conceptual foundations of thermostatistics. In the final chapter, Callen advances his thesis that the symmetries of the fundamental laws of physics underlie the very foundations of thermodynamics and seeks to illuminate the crucial role thermodynamics plays in science.^{[1]}

Callen advises that a one-semester course for advanced undergraduates should cover the first seven chapters plus chapters 15 and 16 if time permits.^{[1]}

The second edition provides a descriptive account of the thermodynamics of critical phenomena, which progressed dramatically in the 1960s and 1970s. Drawing on feedback from students and instructors, Callen improved many explanations, explicitly solved examples, and added many exercises, many of which have complete or partial answers. He also provided an introduction to statistical mechanics with an emphasis on the core principles rather than the applications. However, he sought to neither separate thermodynamics and statistical mechanics completely nor subsume the former under the latter under the banner of "thermal physics." Indeed, thermal physics courses often emphasizes statistical mechanics at the expense of thermodynamics, despite its importance for industry, as a survey of business leaders conducted by the American Physical Society in 1971 suggested. Callen observed that thermodynamics had subsequently been de-emphasized.^{[1]}

**Part I: General Principles of Classical Thermodynamics**- Introduction: The Nature of Thermodynamics and the Basis of Thermostatistics
- Chapter 1: The Problem and the Postulates
- Chapter 2: The Conditions of Equilibrium
- Chapter 3: Some Formal Relationships, and Sample Systems
- Chapter 4: Reversible Processes and the Maximum Work Theorem
- Chapter 5: Alternative Formulations and Legendre Transformations
- Chapter 5: The Extremum Principle in the Legendre Transformed Representations
- Chapter 7: Maxwell Relations
- Chapter 8: Stability of Thermodynamic Systems
- Chapter 9: First-order Phase Transitions
- Chapter 10: Critical Phenomena
- Chapter 11: The Nernst Postulate
- Chapter 12: Summary of Principles for General Systems
- Chapter 13: Properties of Materials
- Chapter 14: Irreversible Thermodynamics

**Part II: Statistical Mechanics**- Chapter 15: Statistical Mechanics in the Entropy Representation
- Chapter 16: The Canonical Formalism; Statistical Mechanics in Helmholtz Representation
- Chapter 17: Entropy and Disorder; Generalized Canonical Formulations
- Chapter 18: Quantum Fluids
- Chapter 19: Fluctuations
- Chapter 20: Variational Properties, Perturbation Expansions, and Mean Field Theory

**Part III: Foundations**- Chapter 21: Postlude: Symmetry and the Conceptual Foundations of Thermostatistics

- Appendix A: Some Relations Involving Partial Derivatives
- Appendix B: Magnetic Systems
- General References
- Index

Robert B. Griffiths, a specialist in thermodynamics and statistical mechanics at the Carnegie Mellon University, commented that both editions of this book presents clearly and concisely the core of thermodynamics within the first eight chapters. At the time of writing (1987), Griffiths knew of books that explained the principles of thermodynamics, but Callen's was had the best presentation of the material. He believed Callen offered a pedagogical, if abrupt, treatment of the subject. His book begins in an abstract manner, assuming the existence and properties of entropy and derive the consequences for various processes of interest rather than through heat engines and thermodynamic cycles or by statistical mechanics and Boltzmann's entropy formula [math]\displaystyle{ S = k \ln \Omega }[/math]. However, he argued that Callen's treatment of critical phenomena (Chapter 10) contains some technical flaws. Callen thought that classical analysis had broken down. But Griffiths wrote that the problem lies not in the breakdown of thermodynamics but rather the Taylor-expansion of thermodynamic quantities, and that precise expressions of the functions appearing in a fundamental relation should be determined by statistical mechanics and experiments, not thermodynamics. Nevertheless, Griffiths still believed this book to be an excellent resource for learning the basics of thermodynamics.^{[2]}

According to L.C. Scott, who studied statistical mechanics and biophysics at Oklahoma State University, *Thermodynamics and an Introduction to Thermostatistics* is a popular textbook that begins with some basic postulates based on intuitive classical, empirical, and macroscopic arguments. He found that it is remarkable for the whole edifice of classical thermodynamics to follow from just a few basic assumptions. However, Scott preferred the discussion of temperature in *Heat and Thermodynamics* by Mark W. Zemansky and Richard H. Dittman because it is based on thermometry and forces students to contemplate the empirical basis of concept of temperature, leaving aside the molecular basis of heat. He argued that such an approach yields greater appreciation for the meaning of temperature and its statistical-mechanical basis which students will encounter later. In contrast, Callen's book does not mention temperature till Chapter 2, where Callen defines temperature as the reciprocal of the derivative of entropy with respect to internal energy then shows, using the postulates, that this definition is consistent with our intuition. While Zemansky and Dittman cover the first law of thermodynamics empirically, Callen simply assumes the existence of the internal energy function the invokes the conservative nature of inter-atomic forces. Whereas Zemansky and Dittman treated the second law of thermodynamics using heat engines and simply state the Clausius and Kelvin formulations of it, in Callen's book, the second law is contained within the postulates. Scott was unsure which approach is more understandable for students. In general, Zemansky and Dittman employed an empirical approach while that of Callen is deductive. Scott opined that Zemansky and Dittman's book is more suitable for beginning students while Callen's is more appropriate for an advanced course or as a reference.^{[3]}

- Callen, Herbert B. (1960).
*Thermodynamics: An Introduction to the Physical Theories of Equilibrium Thermostatics and Irreversible Thermodynamics*(1st ed.). New York: John Wiley & Sons. OCLC 630395039.^{[4]}^{[5]} - Callen, Herbert B. (1985).
*Thermodynamics and an Introduction to Thermostatistics*(2nd ed.). New York: John Wiley & Sons. ISBN 0-471-86256-8. OCLC 1109708066.

- Callen, Herbert (1985). "Preface". Thermodynamics and an Introduction to Thermostatistics. John Wiley & Sons. ISBN 0-471-86256-8.
- Griffiths, Robert B. (September 1987). "Thermodynamics and An Introduction to Thermostatistics". American Journal of Physics 55 (5): 860–1. doi:10.1119/1.14986. Bibcode: 1987AmJPh..55..860C. http://cds.cern.ch/record/450289.
- Scott, L. C. (February 1998). "Thermodynamics and An Introduction to Thermostatistics, 2nd ed". American Journal of Physics 66 (2): 164–7. doi:10.1119/1.19071. Bibcode: 1998AmJPh..66..164C. https://dx.doi.org/10.1119%2F1.19071
- Kestin, J. (1960-09-01). "none" (in en). Journal of Applied Mechanics 27 (3): 599–600. doi:10.1115/1.3644060. ISSN 0021-8936. https://dx.doi.org/10.1115%2F1.3644060
- Bridgman, P. W. (October 1960). "none" (in en). American Journal of Physics 28 (7): 684. doi:10.1119/1.1935945. ISSN 0002-9505. Bibcode: 1960AmJPh..28..684C. https://dx.doi.org/10.1119%2F1.1935945

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