How does a yeast makes a bread to expand?

Answer 1

Yeast, which is added to bread, makes it expand.

The yeast eats the sugars in the dough and produces carbon dioxide which forms little bubbles. The foamy dough takes up more room (expands).

Some breads (soda breads) use a chemical reaction to generate the carbon dioxide from baking powder.

Answer 2

Yeast is a living organism. This means it goes through a process called respiration. A product of respiration is carbon dioxide. So the yeast makes a gas which in a way "inflates" the bread.

Answer 3

Dough with yeast increases in size (rises) because the yeast is a living organism. When combined with moisture and warmth, the yeast eats and digests the sugars in the bread dough, then produces gas. The gas expands as it warms, pushing against the dough and causing it to rise.

Answer 4

Yeast is a living thing and basically it eats sugars and then produces gas which makes things like bread dough rise.

Answer 5

As yeast grows it gives off gas; which causes bubbles to develop inside the dough and makes it rise. Yeast needs sugar or honey to feed its growth.

Answer 6

Because the tiny pockets of gasses in it expand when warmed.

Answer 7

yeast expands because it is yeast