This textbook investigates the fundamental principles of physics and chemistry required for the third year of secondary education (ESO). The authors, Isabel Piñar Gallardo and Patricia Sánchez-Blázquez, utilize the GENiOX pedagogical framework to present scientific concepts through structured lessons, practical exercises, and visual aids designed to facilitate student comprehension of matter, energy, and chemical reactions.

Educators frequently utilize the GENiOX series for its clear alignment with secondary school standards and its accessible instructional design. The text is recognized as a standard classroom resource for students navigating the transition to more rigorous scientific study.