Information about the series: Universum Physik - a new textbook for secondary education level I. The concept of Universum Physik is a teaching and workbook with a clear focus on being a textbook, which is reflected in the 3+1 concept: three information pages are followed by a material page with resources for practice and suggestions for independent experimentation. The textbook presents to students in an understandable way how the world works from a physical perspective. It provides orientation within the scientific discipline and contributes to the understanding of the environment. Universum Physik is characterized by a clear structure and logical progression, thorough development of physical thinking and working methods, language that is accessible to students, careful introduction of technical terms, and a balanced selection of content. Structure: The textbook has a subject-specific systematic structure.