Dancing Raisins

Raisins repeatedly rise and sink. Ask students to predict what will happen. Drop raisins into fresh carbonated water. Key idea: Gas bubbles attach, lower average density, then pop at the top. Ask: What is making the raisins go up? Safety and cleanup: No tasting after demo. https://www.pta.org/docs/default-source/files/programs/stem/2019-20/bayer/dancing-raisins-family-guide.pdf