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.
Yeast is the leavening agent.
It's usually either baking powder or a combination of baking powder and baking soda (it depends on the recipe.)
Baking soda and baking powder - these are the same ingredients that give biscuits their springiness.
Leavening agents used in bread are:
baking powder
baking soda
yeast
A leavening agent used in breads is baking powder. This helps making the density of the bread light and fluffy.
A quick bread usually uses baking powder or baking soda.
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.
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.
Baking soda (sodium bicarbonate).
Milk
It is a leavening agent - it makes food rise.
Leavened bread contains a leavening agent (such as yeast, though others may be used) that makes it rise. Unleavened breads do not. Typically, leavened breads are lighter in texture, whereas unleavened breads are denser and flatter.