density cylinder

In our science class, we made something called a density cylinder. A density cylinder is something when liquids balance on each other and don't mix. To make one, we had five different substances. We needed to find the mass of each substance and divide it by 15 milliliters or the volume of the substances to get the densities. Then we had to slowly pour the substances in at an angle and they would balance. It looked so cool. I was amazed at the results. I had no idea that liquids could possibly balance on top each other. It turns out that if you get different liquids with different densities and pour them in from most dense to least dense that they will balance on top of each other. This was one of the coolest science experiments I've ever done in my life as a student.