“DEVELOPMENT OF PHYSICS E-LEARNING BASED ON PROBLEM BASED LEARNING TO IMPROVE STUDENTS’ HIGH-LEVEL THINKING ABILITIES AND LEARNING INTERESTS IN FLUID MATERIALS: DEVELOPMENT OF PHYSICS E-LEARNING BASED ON PROBLEM BASED LEARNING TO IMPROVE STUDENTS’ HIGH-LEVEL THINKING ABILITIES AND LEARNING INTERESTS IN FLUID MATERIALS”, SPEKTRA, vol. 11, no. 2, pp. 245–256, Oct. 2025, doi: 10.32699/spektra.v11i2.9700.