Yeast and baking powder is mostly used for baking purposes. Baking powder is a chemical ingredient known as a mixture of sodium bicarbonate and acid salts. On the other hand, yeasts are eukaryotic microorganisms grouped with members of the fungus kingdom. This grouping is the significant difference between yeast and baking powder.
Baking powder is also made by blending baking soda with a dry cream of tartar, acid, and other salts. However, once too much acid is present, some baking powder can be substituted with baking soda. Yeasts are unicellular microorganisms, and by fermentation, the yeast species converts carbohydrates to carbon dioxide and alcohol, which is employed to manufacture the alcohol in alcoholic beverages.
As a leavening instrument in baked goods, carbon dioxide causes the dough to expand or increase. When the bread is baked, the yeast perishes and sets itself as a soft, spongy texture.