What is leavend bread?

Leavend bread is bread that has been made using a leavening agent to cause it to rise. Leavening agents include yeast, baking powder, and baking soda. Yeast is a fungus that produces carbon dioxide gas when it reacts with water and sugar. This gas causes the bread to rise. Baking powder contains sodium bicarbonate and an acid, such as cream of tartar. When these two ingredients mix with water, they produce carbon dioxide gas. Baking soda contains sodium bicarbonate only. It must be used with an acid, such as buttermilk or yogurt, to produce carbon dioxide gas. Leavend bread is lighter and more airy than unleavend bread, which is made without a leavening agent.