The book “Equilibrium in Multicomponent Systems” by B. In. Belika and E. In. Kudryashova, published in 1986 at MHTI, is a textbook that will become an indispensable assistant for students, graduate students and specialists in the field of chemical technology, physical chemistry and related disciplines. This publication not only immerses the reader in the theoretical foundations, but also offers practical approaches to the study of complex multicomponent systems, which makes it relevant today. The book covers a wide range of topics related to equilibrium in systems consisting of several components. The authors examine in detail the thermodynamic aspects, as well as the mechanisms that influence the behavior of these systems. Readers will be able to learn about the principles of phase equilibrium, thermodynamic potentials and their application in various fields of science and technology. Interestingly, the authors focus on the practical application of the theory, which allows a better understanding of how these concepts work in real-world conditions. This manual will be particularly useful for undergraduate and graduate students studying physical chemistry, materials chemistry, and engineering sciences. It can also attract the attention of researchers and practitioners working in the field of chemical technology, ecology and materials science. If you are interested in topics such as thermodynamics, chemical kinetics or the development of new materials, this tutorial will be a real find for you. The style of the authors is distinguished by clarity and accessibility, which makes it easy to assimilate even the most complex concepts. In. In. Belik and E. In. Kudryashov are known for their scientific works and teaching aids, which are respected among students and teachers. Their approach to learning is based on a deep understanding of the subject and the desire to convey knowledge to the reader in the most understandable form. This makes their work particularly valuable for those who seek a deep understanding of the topic. The topics raised in the book are important not only for theorists, but also for practitioners. Understanding equilibrium in multicomponent systems can significantly affect the development of new technologies, such as the creation of efficient catalysts, the development of new materials with specified properties and the optimization of processes in the chemical industry. The book also touches on issues of sustainable development and ecology, which makes it relevant in the context of modern challenges. If you are looking for a tutorial that combines theory and practice, and are looking to expand your knowledge in the field of multi-component systems, “Equilibrium in multi-component systems” will be an excellent choice. This edition will not only enrich your library, but also help you in your studies and professional activities. Do not miss the opportunity to get acquainted with the works of authors who rightfully occupy their place among the best textbooks in physical chemistry and engineering sciences.