<![CDATA[Physics learning on Fluid Mechanics at State High School 1 Kupang faces obstacles due to students' difficulty in understanding abstract concepts using conventional methods. This study aims to design and implement an interactive Augmented Reality (AR) application on the Android platform to visualize 3D fluid mechanics objects. The development uses the Waterfall model, comprising needs analysis, UML design, implementation with Unity 3D and the Vuforia SDK (Marker-Based Tracking), and testing. System testing utilized Black Box testing for functionality and User Acceptance Test (UAT) questionnaires for user response, analyzed using descriptive quantitative methods on a sample of 30 students (n=30). The Black Box test yielded 100% validity without errors. Meanwhile, the UAT resulted in a feasibility score of 79.59%, categorized as "Good/Feasible". This research successfully produced a viable and innovative learning media application capable of increasing interactivity and students' conceptual understanding of Fluid Mechanics]]>
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