Baking powder is a chemical leavening agent, yeast is a biological leavening agent, yeast put more less can be, five poison does not affect the taste, more fermentation fast, less fermentation slower, but baking powder can not be, its main ingredient is sodium bicarbonate and acidic substances, in contact with water, the release of gases, the fermentation is very fast, but too much food will be bitter, affecting the taste

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