Activity
Science is Fun

Fun Science: Bowling Balls: Sink or Float?

For Students 9th - 10th
For a dramatic illustration of density check out this demonstration. It's simple to do, only requiring a bowling ball and some water.
Activity
Science is Fun

Science Fun: Layered Liquids

For Students 9th - 10th
This experiment allows you to dramatically demonstrate the different densities of five different common household liquids.