Bubble Film in a Cube

Flat films form surprising interior shapes. Ask students to predict what will happen. Dip cube frame in solution. Key idea: Surface tension minimizes surface area while satisfying the frame boundaries. Ask: Why don't the films simply copy the cube walls? Safety and cleanup: Use tray; avoid soap in eyes. https://www.google.com/search?q=%22Bubble+Film+in+a+Cube%22+science+demonstration+experiment