Educational Innovations sells a Poly Density Kit. The beads settle in the middle of the solution, a mixture of alcohol, water, and salt. The beads are made of different materials. A teacher posted about a lab she does using pony beads and UV pony beads. The UV beads are slightly less dense. Temu, Amazon, and Educational Innovations sell UV beads. I took a screen shot with her instructions for individual density bead demos. I took a screen shot below to give her credit. Tap on the photo to read the directions. I use this activity as a discrepancy event. I show the kids and ask them to figure out why the beads settle in the middle. Fun, right?
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