The instruction of introductory fluid mechanics is often characterized as mathematically onerous and conceptually difficult due to the inherent non-linearity of governing equations and a persistent lack of accessible visualization tools. This study aimed to design, develop, and evaluate a low-cost, accessible experimental toolbox to transform static lectures into active learning environments that facilitate the practical application of hydraulic and fluid principles. Utilizing a developmental research design, the study proceeded through iterative phases of design, construction using locally sourced sustainable materials, and evaluation. The participants consisted of 33 undergraduate science education students from a state university in Zambales, Philippines. The experimental apparatus and research instruments, including pre/post-assessments and usability checklists, were validated by four experts in physics and science education before full-scale implementation. Statistical analysis was conducted using n-gain analysis to quantify learning improvements, while paired t-tests were utilized to determine the significance of score improvements alongside descriptive statistics for engagement and usability data.

The implementation of the experimental toolbox resulted in a statistically significant advancement in student conceptual understanding, with post-assessment scores showing a robust grasp of fluid principles. Students reported high levels of engagement and motivation, particularly noting that manipulating everyday materials provided a tangible connection to theoretical concepts. Developed at a total production cost of only P1,860.00, the toolbox demonstrates that high-quality experiential learning can be achieved with minimal financial investment. The study concludes that this “frugal science” approach effectively bridges the theory-practice gap by solidifying theoretical understanding through active, student-led investigations. These findings highlight the potential for portable, low-cost laboratory equipment to democratize access to STEM education by providing scalable alternatives for resource-constrained institutions.

Keywords: Fluid Mechanics Education, Active Learning, Experimental Toolbox, Frugal Science, STEM Education, Conceptual Understanding.