Quick bread leavening agents include a weak base, such as baking soda (sodium bicarbonate) plus a weak acid, such as cream of tartar, lemon juice, or cultured buttermilk, to create an acid–base reaction that releases carbon dioxide. (Quick bread leavened specifically with baking soda is often called "soda bread".) Baking powder contains both an acid and a base in dry powdered form, and simply needs a liquid medium in which to react. Other alternative leavening agents are egg whites mechanically beaten to form stiff peaks, as in the case of many waffle recipes, or steam, in the case of cream puffs. Nevertheless,
Fish and chips food chains, resulting in a lower fat content per portion. In their homes or in some restaurants, people in or from the United States may eat a thick type of chip, more similar to the British and Irish variant, sometimes referred to as steak fries. In Britain and Ireland, fish and chip shops traditionally use a simple water and flour batter, adding a little sodium bicarbonate (baking soda) and a little vinegar to create lightness, as they react to create bubbles in the batter. Other recipes may use beer or milk batter, where these liquids are often substitutes for water.