Density Tower

I did another fun demonstration for my grade 8s this week.  First we looked at what solid objects float on water and which sink (see photo below for results).  Then we talked about density and how less dense fluids will float on those that are more dense.  I constructed a density tower with NINE different fluids.  Then we took the same solid objects and observed which ones floated, which ones sank and at what level they rested.  It was very good at showing them everything we have been learning and something you can try at home.  See this website for instructions.

To illustrate the practical applications, other then petrochemical ones, I made them each a mini Shirley Temple showing them how orange juice floats on grenadine!  YUM!!

Supplies

What floats on water?

Tower before and after!