What is baking powder and how is it different than baking soda?
A. Baking powder is a leavening containing a combination of baking soda, an acid (such as cream of tartar) and a moisture-absorber (such as cornstarch). When mixed with liquid, baking powder releases bubbles that cause a bread or cake to rise. The most common type of baking powder is double acting, which releases some gas when it becomes wet and the rest when exposed to oven heat. Because it’s perishable, baking powder should be kept in a cool, dry place. Always check the date on the bottom of a baking-powder can before purchasing it. To test if a baking powder still packs a punch, combine 1 teaspoon of it with 1/3 cup hot water. If it bubbles enthusiastically, it’s fine.
