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.
If you mean leavening ingredients, they are used to make baked goods rise. Baking powder, baking soda, and yeast are all leavening agents.
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The ingredients in a cake, that make it light and fluffy, are the proteins from the eggs and flour. If you are using egg whites and beating them, the air thatâ??s incorporated in them will also add to the lightness of the cake.
"Flour contains high proportion of starches, which are complex carbohydrates also known as polysaccharides. Leavening agents are used with some flours, especially those with significant gluten content, to produce lighter and softer baked products by embedding small gas bubbles."
Although there is a risk that cakes and other baked goods may not rise quite as much when baked at sea level, increasing the quantities of chemical leavening agents used is quite likely to give the baked good a noticeably chemically aftertaste. For example, using too much bicarbonate of soda results in a taste somewhere between salty and chemically. Unfortunately I cannot give you an exact ratio for at what stage chemical leavening agents become noticeable in taste; some people may be able to taste them at far lower concentrations than other people will begin to find them unpleasant. Using cake recipes which get some or most of the leavening from beaten eggs or egg whites is probably a better solution that heaping in more chemical leavening agents. E.g Chiffon sponges.
No, baking soda is just sodium bicarbonate, a leavening agent that reacts with salt and water to form gas and rise your baked products.
No. But they both serve as leavening agents. Baking powder has baking soda in it
Baking powder is a leavening agents, which means it is added to baked goods before cooking to produce carbon dioxide and cause it to 'rise'. Baking powder contains baking soda, but the two substances are used under different conditions.
Yeast.
Leavening agent is important in baking due to the rising qualities of the baked item and the crumb quality of the finished result. Not adding enough makes for a really puffed up result, and too little results in a baked rock.
Air expands when heated, so if you are able to get enough air bubbles into a cake batter, the batter will expand when baked. This is the process behind the leavening action of whipped eggs in a Genoise sponge.