  In our daily lives, we observe objects sinking, floating, or rising when
immersed in a fluid. The Archimedes principle, which explains an object's
behavior when immersed in a fluid, is important in fluid mechanics; however, it
is a relatively complex concept for middle school students to grasp, as they
often harbor misconceptions. To initiate conceptual change among students
regarding the misconception "heavy objects sink and light objects float," I
created a project during which students build a stable submarine that uses
fluid transfers to move up, down, and forward while carrying a load. Students
must take into account several variables, from the design of the submarine to
the choice of materials. Additionally, students write a report that includes a
user manual, challenges they encountered and how they overcame those
challenges, and a detailed text that links theory to their submarine.
