Leavening agents are the ingredients that make the baked goods rise so they are light and airy. It could be yeast, baking soda, or baking powder. Sometimes in cakes, the eggs are whipped into a froth to add air to the cake and this acts as a leavening agent.
They are chemical (non-yeast) leavening agent usually used in quick breads, cakes and cookies.
Yeast is used in many leaven breads. However, many breads use other leavening agents such as baking soda. Other breads use no leavening agent at all; these include matzo, flatbreads, tortillas, cornbread.
A quick bread is a type of bread that is leavened with baking powder or baking soda instead of yeast. It is called "quick" because it can be made quickly without the need for time-consuming proofing or kneading. Quick breads include items like muffins, scones, and banana bread. The main difference between quick breads and other types of bread is the leavening agent used and the lack of yeast, which gives quick breads a different texture and flavor compared to traditional bread.
Aluminum phosphate is commonly used as a leavening agent in baking powder, which is used in a variety of baked goods such as cakes, cookies, and breads.
The leavening of bread is the ingredient which aids in the rising process. Yeast is the typical leavening agent used to make bread. Depending on the bread, there are variations of yeast to choose from including active dry yeast and quick-rise yeast.
Baking powder is used as leavening in baked goods such as cookies, cakes, quick breads, biscuits and pancakes. It creates gas in the batter that causes the product to rise.
A well-made quick bread should be moist and hold together well. Not too dry, and not too moist or heavy.
Baking powder is useful for mixing into many types of batter and dough as leavening. It already contains an acid, so it does not need additional acid in the batter, as baking soda needs. Some baked good that use baking powder as leavening are Quick Breads, Cookies, Biscuits, Cornbread, Muffins, Pancakes and Waffles.
I only know of three, so maybe someone else will be able to give you the fourth one:baking powderbaking soda and sour milk/buttermilksteam
The function of leavening agents is to cause the baked goods (breads, cakes, etc.) to rise. There are different types of leavening agents, such as yeast, baking powder and baking soda. Eggs are also sometimes used as a leavening agent, especially in some pound cake recipes. Without leavening, the baked goods will not only be flat, but won't taste as good, either.
Milk
Baking soda (sodium bicarbonate).