Yeast is a single celled fungi that feeds on sugars. The yeast eats the sugar. Then it releases carbon dioxide gas. The gas fills the jar as more gas is produced, it will fill the balloon. You will use yeast to make bread, however In bread dough, the carbon dioxide from the yeast gets trapped in the gluten from the flour. The yeast dies in the hot oven and the gluten solidifies leaving us with wonderfully soft bread! By harnessing the power of yeast, kids and students can observe firsthand ho