The book *Tables and Diagrams I-S for Water Vapor Based on the Latest Experimental Data* by A.V. Popov is a groundbreaking scientific publication that will captivate not only thermodynamics and heat engineering specialists but also anyone eager to deepen their understanding of water vapor and its properties. This edition, a reprint from the *Reports of the Imperial Peter Polytechnic Institute*, offers readers a fresh perspective on a well-studied yet still highly relevant subject. Focusing on the development and presentation of new tables and diagrams, the book describes the behavior of water vapor based on the latest experimental findings. Water vapor is far more than a simple state of matter; it plays a crucial role in numerous technological processes, from energy production to climate science. A.V. Popov delves deeply into the physics and chemistry of water vapor, providing not only precise data but also insightful interpretations—making this work especially valuable for researchers and practitioners alike. The topics covered span a broad range: from the thermodynamic properties of water vapor to its applications across various industries such as energy, chemical manufacturing, and environmental science. Popov emphasizes the importance of accurate data for process optimization, making this book highly relevant for engineers, scientists, and students studying thermophysics and thermodynamics. Those interested in modern research methods and analytical techniques will find plenty of useful information within. Popov’s clear and accessible style ensures that even readers without specialized training in thermodynamics can grasp the core concepts and ideas. His previous works, including *Thermodynamics and Its Applications in Energy* and *Physics of Water Vapor*, have been praised for their clarity and practical focus. In this book, the author continues to expand on these ideas, offering not only theoretical insights but also practical recommendations. This publication will be especially appealing to students and graduate students in engineering disciplines, as well as practicing engineers working in heat energy and related fields. It will serve as an indispensable reference for those involved in designing and optimizing systems that utilize water vapor, as well as for researchers exploring thermodynamics and the physics of condensed media. Don’t miss the opportunity to explore the fascinating world of thermodynamics with A.V. Popov’s work. It will not only broaden your knowledge of water vapor but also inspire new ideas and research directions. This is more than just a collection of tables and diagrams—it's a universe where every reader can find something valuable and intriguing. If you’re seeking a high-quality scientific publication that combines theory with practical application, *Tables and Diagrams I-S for Water Vapor Based on the Latest Experimental Data* is the perfect choice.