THE EFFECTIVENESS OF THE HEAT AND ITS TRANSFER E-MODULE BASED ON PROBLEM-BASED LEARNING TO IMPROVE STUDENTS’ PROBLEM-SOLVING SKILLS. SPEKTRA [Internet]. 2025 Oct. 10 [cited 2025 Nov. 27];11(2):270-81. Available from: https://ojs.unsiq.ac.id/index.php/spektra/article/view/9882