The available teaching materials still need to follow the characteristics of students. It causes students to find it challenging to understand the concept. One alternative to overcome this problem is to make teaching materials based on elaboration strategies. This research aims to produce teaching materials based on elaboration strategies, especially thermodynamics materials that have good validity, practicality, and effectiveness. This type of research is Research and Development (R&D). To achieve the above objectives, the steps taken were 1) identifying potentials and problems, 2) gathering information, 3) designing products, 4) validating designs (with five experts), 5) revising products, and 6) testing products. Based on the data analysis that has been done, the research results could be presented. First, teaching materials have validity with an average value of 84.32 experts. Second, the practical value of teaching materials based on elaboration strategies was 85.87 based on the physics teacher's assessment and 83.97 based on student assessments. Third, the use of teaching materials in effective learning was characterized by increased student physics learning outcomes from 45.57 to 76.43.