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.
My Science Site
Density Demonstration: Coke vs. Diet Coke [Pdf]
Help students brainstorm and find a solution as to why Diet Coke floats and Coke sinks. Student will learn to define what density is as they engage in this creative lab. This resource is in PDF form; requires Adobe Reader.
Science is Fun
Science Fun: Layered Liquids
This experiment allows you to dramatically demonstrate the different densities of five different common household liquids.
Science is Fun
Fun Science: Sinking and Floating Soda Cans
Why do some pop cans float in water while others don't? This easy experiment is a great example of the principle of density.
Science is Fun
Fun Science: Bowling Balls: Sink or Float?
For a dramatic illustration of density check out this demonstration. It's simple to do, only requiring a bowling ball and some water.
Utah Education Network
Uen: Matter: I Love Density
Directions for a lab that compares the density of a marble, wood, water and two different types of candy bars.
Science and Mathematics Initiative for Learning Enhancement (SMILE)
Smile: Comparing Liquid Density
Because different liquids have different properties, density also differs. In this lesson from the Illinois Institute of Technology, learners will calculate densities of water, dish-washing detergent, cooking oil, and other liquids.
Science and Mathematics Initiative for Learning Enhancement (SMILE)
Smile: Density in Relation to Float and Sink
Students find the densities of objects based on sinking or floating in this activity that demonstrates Archimedes Principle.
Science and Mathematics Initiative for Learning Enhancement (SMILE)
Smile: Comparing Densities of Different Liquids
This lab experiment has students observe and compare the density of five different liquids while measuring mass and volume.
Other
Lapeer County Schools Science Resources: Density Lab
A simple lab experiment for students to find the density of two solids and a liquid (does not use water displacement). Note that number 1d should not state "weighs" since mass is being found.