The book *Problem Book on Technical Thermodynamics and Heat and Mass Transfer* by V.N. Afanasyev, S.I. Isayev, I.A. Kozhinov, and others is a unique resource designed to become an indispensable guide for students, graduate students, and professionals in engineering fields. This volume is more than just a collection of problems—it's a vibrant world where thermodynamics and heat and mass transfer come alive through practical examples and engaging exercises. Featuring a wide range of problems of varying difficulty, the book covers all key aspects of technical thermodynamics and heat and mass transfer theory. Readers will find both straightforward and more challenging tasks, making this guide suitable for a broad audience—from beginners just starting to explore these disciplines to seasoned engineers looking to refresh their knowledge or prepare for exams. Each section is carefully structured to facilitate easy navigation and quick access to relevant topics. The book addresses a broad spectrum of issues, from fundamental thermodynamic processes to complex heat exchange systems. The authors emphasize practical application of theory, adding value for future engineers and scientists by helping them see how concepts translate into real-world solutions. The authors’ clear and accessible writing style makes even complex ideas easy to understand and engaging to explore. Afanasyev, Isayev, and Kozhinov are renowned experts in thermodynamics, and their extensive teaching and research experience is reflected on every page. Their previous works have earned recognition in academic circles, and this problem book continues their tradition of sharing knowledge and supporting students’ academic success. This book is especially useful for those preparing for exams or seeking to deepen their understanding of thermodynamics and heat and mass transfer. It can serve as an excellent supplement to coursework or as a foundation for independent study. Readers interested in fluid mechanics, heat exchange processes, and energy systems will find numerous practical problems that reinforce theoretical concepts and enhance comprehension. Don’t miss the opportunity to dive into the world of thermodynamics and heat and mass transfer with *Problem Book on Technical Thermodynamics and Heat and Mass Transfer*. More than just a textbook, it’s a key to understanding the complex processes behind many engineering solutions. If you’re looking for a high-quality educational resource that will help you prepare for exams and expand your knowledge, this volume will be your reliable companion on the path to success in your engineering career.