DEVELOPMENT OF PHYSICS E-LEARNING BASED ON PROBLEM BASED LEARNING TO IMPROVE STUDENTS’ HIGH-LEVEL THINKING ABILITIES AND LEARNING INTERESTS IN FLUID MATERIALS. SPEKTRA [Internet]. 2025 Dec. 1 [cited 2026 May 28];11(2):245-56. Available from: https://ojs.unsiq.ac.id/index.php/spektra/article/view/9700