The hypothesis is that yeast produces carbon dioxide gas, which makes bread rise and gives it a fluffy texture.

You will mix lukewarm water, sugar, and yeast in a plastic bag, then put it in a warm place.

You will need one large Ziploc-type freezer bag, one envelope of "rapid-rise, active, dry yeast", 1 cup lukewarm water, and 1/2 cup sugar.

After an hour, you will see that the bag has partially filled with gas, and that the liquid is full of carbon dioxide bubbles that the yeast has produced. You may even see a noticeable amount of puffiness in the bag after two hours.

This science project is interesting because it shows how a tiny organism like yeast can have a big impact on the texture of bread.

Experiment variations to consider include using different types of yeast, different temperatures of water, and different amounts of sugar.

Hey there! Here are some awesome videos about this science project that we think you'll really like. They're not only super fun, but they'll also help you learn more about the science behind the project. So sit back, relax, and get ready to have some fun!!