The book "Studying the magnetic properties of substances and the phenomenon of hysteresis in ferromagnets" by B. In. Black is an exciting and deep dive into the world of physics, which will be an indispensable tool for both students and professionals in the field of materials science and physics. In this work, the author explores the complex magnetic properties of substances, focusing on ferromagnets and the phenomenon of hysteresis, which plays a key role in understanding magnetic processes. In. In. Black, known for his scientific works and research in the field of physics, creates an accessible and understandable text that combines the theoretical foundations and practical aspects of the topic under study. The book not only sets out the facts, but also offers the reader the opportunity to realize how the magnetic properties of substances affect various aspects of our lives - from technology to nature. This makes it particularly interesting for undergraduate and graduate students studying physics, as well as for engineers and researchers working in the field of magnetic materials. One of the key themes of the book is the phenomenon of hysteresis, which is manifested in how ferromagnetic materials react to external magnetic fields. Black examines in detail the mechanisms behind this phenomenon, explaining how it relates to the microscopic structures of materials. The reader will learn how hysteresis affects the behavior of magnetic materials in various conditions, which is important for the development of new technologies, such as magnetic drives and transformers. The book also touches on issues related to the use of ferromagnets in modern technologies. For example, the author discusses how magnetic properties affect the efficiency of electrical machines and devices, which makes the material relevant for engineers and developers. This is not just a textbook, but a real find for those who want to understand how the physics of magnetic phenomena can be applied in practice. Black's style is distinguished by clarity and logical presentation, which allows the reader to easily assimilate complex concepts. It uses many examples and illustrations, which makes the material more accessible and interesting. The book is full of graphs and diagrams that help to visualize the phenomena being studied and make the learning process more exciting. This work will be particularly useful for undergraduate and graduate students who study physics, materials science, and engineering sciences. It may also be of interest to teachers who are looking for quality teaching materials for their courses. In addition, the book will be of interest to anyone who wants to deepen their knowledge about the magnetic properties of substances and their application in modern technologies. If you are looking for literature that combines in-depth scientific research and practical application, “Study of the magnetic properties of substances and the phenomenon of hysteresis in ferromagnets” will be an excellent choice. This book will not only expand your knowledge of magnetic phenomena, but will also inspire further research in this fascinating field of physics. Do not miss the opportunity to immerse yourself in the world of ferromagnets and discover new horizons of science!