Scholastic
Scholastic: Dirtmeister's Science Lab: That Sinking Feeling
Simple experiments dealing with water temperature and density that you can complete in the lab and at home.
Middle School Science
Mss: Density Demonstration: Coke vs. Diet Coke
In this demonstration, students will brainstorm to find a solution as to why Diet Coke floats and Coke sinks. Through this exercise students will arrive at a definition of density.
Other
The Science House: Daffy Densities
In this lab experiment, students will use 4 solids and 6 liquids to create colorful, layered rows demonstrating that less dense materials will float on top of the more dense materials.
Other
The Science House: Red, White, and Blue Ii
This colorful demonstration illustrates the rule, "likes dissolve likes," by combining three, immiscible liquids to create a density column." Teacher notes provide background information.