(Project by Catie Gosselin at http://womanlinks.com)
This is a fun activity to combine with baking quick (any bread product that has no yeast) and yeast breads. Take a slice of both types of bread and ask your child, after looking at it, where all the bumps and crannies come from since the bread dough is smooth. Let them open the jar of yeast to look at, smell, or drop some in their hands.
Materials : 1 tsp. yeast, 1 tsp. sugar, warm water, a drinking glass
Mix all ingredients, stirring once gently, and observe over time what happens (maybe 1/2 to 1 hour). The yeast mixture will bubble and grow, and then fall.
After performing the experiment, ask the kids what they think caused the reaction. Why did it grow and then fall? The yeast is a single-celled fungi that consumed the sugar and gave off a gas in return. The generation of gas caused the growth. Once all the sugar was consumed, gas production stopped and the mixture shrunk.
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