Some questions of the probabilistic description of entropy in the study of molecular physics

  • M.S. Moldabekova Al Farabi Kazakh National University, Kazakstan, Almaty
  • M.K. Asembayeva Al Farabi Kazakh National University, Kazakstan, Almaty
  • O.V. Fedorenko Al Farabi Kazakh National University, Kazakstan, Almaty

Abstract

The explanation problem of the probabilistic description of entropy in the study of the second law of thermodynamics to students is considered. Our discussion is limited by the description of the equilibrium properties that can be calculated as the most probable values. It is emphasized that only irreversible processes contribute to the production of entropy. It is shown that entropy is a random variable whose mean value has a macroscopic physical meaning. Attention is drawn to the fact that the system fluctuates near an average state in the equilibrium condition. It is noted that there is a clear distinction between the macroscopic behavior of the system and the fluctuations. It is shown that the methods of statistical mechanics give not only a description of the average behavior and a method for calculating the fluctuations probability of any magnitude near its mean value. Attention is drawn to the fact that the Boltzmann law of entropy increment is interpreted as a tendency to the disorder increase. This method allows us to determine the most likely macrostate of the system or the most probable distribution of subsystems in the system.

References

1. Пригожин И. Введение в термодинамику необратимых процессов. – М.: Комкнига, URSS, 2001. – 160 c.
2. Молдабекова М.С. Термодинамика необратимых процессов: Учебное пособие. – Алматы: Қазақ университеті, 2004. – 102 с.
3. Аскарова Ә.С., Молдабекова М.С. Молекулалық физика: Оқулық. –Алматы: Қазақ университеті. – 246 б.

References
1. Prigozhin I. Vvedenie v termodinamiku neobratimyh processov, M.: Komkniga, URSS, 2001. –160 s. (in russ.)
2. Moldabekova M.S. Termodinamika neobratimyh processov: Uchebnoe posobie. – Almaty: Qazaq universitetі, 2004. – 102 s. (in russ.)
3. Askarova Ә.S., Moldabekova M.S. Molekulalyq fizika: Oqulyq. – Almaty: Qazaq universitetі. – 246 b. (in kaz.)
Published
2017-10-10
How to Cite
MOLDABEKOVA, M.S.; ASEMBAYEVA, M.K.; FEDORENKO, O.V.. Some questions of the probabilistic description of entropy in the study of molecular physics. Recent Contributions to Physics (Rec.Contr.Phys.), [S.l.], v. 61, n. 2, p. 138-141, oct. 2017. ISSN 2663-2276. Available at: <https://bph.kaznu.kz/index.php/zhuzhu/article/view/550>. Date accessed: 27 oct. 2020.
Section
Methods of teaching high school physics

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