This textbook investigates the fundamental principles of physics and chemistry required for the second year of secondary education (ESO). The authors, Eva López Pérez and Jorge Barrio Gómez de Agüero, utilize a structured pedagogical framework to introduce core scientific concepts, laboratory safety, and the scientific method. The text aims to build a foundational understanding of matter, energy, and chemical reactions through clear explanations and illustrative examples.

This text is designed as a foundational resource for secondary school students, focusing on clarity and curriculum alignment. Educators frequently utilize this volume to provide a standardized introduction to physical sciences within the Spanish educational system.