The Water Swap That Makes Box Mix Cakes Extra Fluffy - Chowhound

Behind every fluffy cake and pastry are heaps of air bubbles — literally! If you cut into a slice of cake, you'll find the spongy interior to be filled with lots of tiny air bubbles and chambers. These bubbles form from the air that manages to slip into the batter while it's being whisked. Then, as the cake rises in the oven and the batter expands, these bubbles grow and form micro-structures within the cake,…