This handout provides the instructions and background information for this Engineering Design Challenge where students design and build something that achieves neutral buoyancy in a tank of water. The handout includes a definition of the terms neutral buoyancy and density. This activity can supplement a unit or lesson on density or buoyancy and could even be related to real-life scenarios such as submarine design or fish anatomy (swim bladders).
This activity requires access to a tank (I used an empty fish tank) and various materials such as plastic bottles, sand, corn kernels, soda, etc. This is a great, hands-on learning experience for children in grades 6-12.