Textbook in PDF format This book provides a comprehensive overview of the impact of environmental constituents on the mechanical properties of semiconductors. Chapter 1 sets the stage by outlining the various environmental constituents that can have deleterious effects on both the mechanical properties of materials and the health of those who handle them. This includes gases such as oxygen, nitrogen, hydrogen, air, and moisture in the air, some of which are responsible for greenhouse gas emissions that directly affect the climate. Chapters 2 through 12 delve into specific aspects of mechanical behavior, including elastic properties, plastic deformation, defects, hardness, brittle behavior, impact testing, deformation processes, and time-dependent deformation. The book also examines how the behavior of semiconductors differs at the nano scale and provides insights into improving their mechanical properties