6 Let’s Talk Trash! JAN / FEB 2026 ©2025-2026 The Keenan Group, Inc.
It’s Science! It’s ALIVE!
Materials Needed: plastic bottle • balloon • yeast packet • 1 cup warm water (not hot, which would kill the yeast) • 1 tablespoon sugar
Instructions:
1. Pour warm water into the bottle. 2. Add yeast and sugar. 3. Gently swirl to mix. 4. Stretch the balloon over the bottle opening. 5. Place in a warm spot and observe for 10–30 minutes. * Yeast eats the sugar and produces carbon dioxide gas , which fills the balloon and makes it expand. This shows that yeast is a living fungus that uses sugar for energy and releases gas as part of its life process.
Source: https://www.exploratorium.edu/snacks/yeast-balloon
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