Sheet Pan Science by Liz Lee Heinecke

Author:Liz Lee Heinecke
Language: eng
Format: epub
Publisher: Quarry Books
Published: 2022-01-15T00:00:00+00:00

FIG. 15 Check the plastic bag again and let the carbon dioxide gas out so that it doesn’t explode. Throw the bag away.

15. Bake the rolls at 375°F (190°C, or gas mark 5) for 15 to 20 minutes, until they are light brown and the center is done. Eat your science experiment. FIG. 16.

FIG. 16 Bake the yeast rolls at 375°F (190°C, or gas mark 5) and then eat your science experiment.

THE SCIENCE BEHIND THE FUN

Yeasts are microbes called fungi. Thanks to yeast, humans have been making bread for more than 4,000 years. Yeast cells need energy to grow and multiply. They love to eat sugar and starches, like the ones in bread flour. As they eat and grow, yeast cells produce carbon dioxide gas. This is the same gas that makes the plastic bag in this lab puff up.

In bread dough, carbon dioxide gas from yeast makes tiny bubbles that make the bread rise. The bubbles pop during baking, leaving the small holes you see in bread. The active bread yeast usually used for baking is dried and can’t grow until you add water to it.

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