Definition of the universal gas constant, molar mass and air density . Methodical instructions for laboratory work" is a unique manual created by a team of authors, which will become an indispensable assistant for students and teachers engaged in the study of physics and chemistry. In this edition you will find not only theoretical foundations, but also practical recommendations that will help you successfully carry out laboratory work and better understand the key concepts of gas theory. This book focuses on three major topics: the universal gas constant, molar mass, and air density. These concepts are fundamental in the study of gases and their behavior under different conditions. The authors offer readers not just a set of formulas and equations, but also a detailed explanation of how these values are related to each other and how they can be measured in laboratory conditions. Each section of the book is filled with clear and accessible explanations, which makes the material understandable even for those who are just beginning to get acquainted with the physical and chemical processes. The book will be especially useful for students of technical and natural science specialties, as well as teachers who are looking for high-quality methodological guidelines for the organization of the educational process. If you are passionate about science, strive for a deep understanding of physical phenomena and want to develop your practical skills, this publication will be a real find for you. It is ideal for students of universities, colleges and schools, as well as for anyone interested in experimental physics and chemistry. The topics raised in the book are relevant and important not only for the educational process, but also for practical application in various fields of science and technology. Understanding the gas laws and properties of air is of great importance in areas such as meteorology, aviation, ecology and many others. The book helps the reader to realize how theoretical knowledge can be applied in practice, which makes it especially valuable for future specialists. The style of the authors is distinguished by clarity and logical presentation, which allows the reader to easily assimilate complex concepts. They use many examples and illustrations, which makes the learning process more exciting and visual. In addition, the book provides practical tasks that will help to consolidate the acquired knowledge and skills .. This makes the manual not only a theoretical, but also a practical guide, which is especially important for students who need to be able to apply their knowledge in practice. If you are looking for literature that will help you understand the basics of gas theory and teach you how to conduct laboratory research, pay attention to this publication. The book “Definition of the universal gas constant, molar mass and air density” will become a reliable companion on your way to scientific discoveries and new knowledge. It will not only enrich your knowledge, but also inspire you to further study physics and chemistry. Thus, this manual is not just a book, but a real find for everyone who seeks knowledge and wants to understand the laws that govern our world more deeply. Do not miss the opportunity to take a step towards new discoveries and expand your horizons with this unique edition!