Buzz
It’s often said that cooking is an art, while baking is a science. Cooking allows for flexibility—you can estimate quantities and adjust flavors based on personal preference. Baking, however, requires precision. You can’t taste the batter to gauge the final result, nor can you sample the cake while it’s in the oven.
While you can experiment with flavor components in a cake, the structural ingredients—like oils, eggs, and leavening agents—demand precise measurements. Recently, NPR’s science podcast Short Wave explored the science of baking. To mark Short Wave’s third anniversary, the team collaborated with biochemist and baker Adriana Patterson to create a lighter, tastier cake using scientific methods—a technique you can replicate at home.
“We believe that science is everywhere and for everyone,” Short Wave producer Berly McCoy shared with Mytour. “Short Wave is a welcoming space. Our goal is to spark curiosity about science in as many people as possible.”
How Science Can Help You Bake a Lighter, Fluffier Cake
Patterson describes a cake as “baked, stabilized foam,” akin to a sponge in its composition. To achieve an exceptionally fluffy texture, it’s crucial to incorporate as much air as possible. “The more air you introduce, the more sponge-like and airy it becomes,” Patterson elaborated during the podcast.
Incorporating a leavening agent such as baking soda into your cake batter infuses it with carbon dioxide. When combined with an acidic component and liquid, baking soda generates tiny bubbles in the mixture—bubbles that must be preserved by avoiding overmixing. As heat is applied, these air bubbles expand, resulting in a light and fluffy cake.
For an exceptionally fluffy cake, however, baking soda alone isn’t enough. Science—and meringue—come into play. Egg whites consist of roughly 10% protein, composed of long chains of coiled amino acids suspended in water. “Whipping them at high speed incorporates air and unwinds the protein chains,” Patterson explained. “These unraveled proteins form a network that traps air, creating additional pockets of fluffiness.”
Buttercream frosting is a colloidal dispersion of C12H22O11 and milk phosphoprotein
The science of cake frosting is less complex than that of cake baking, as it doesn’t involve heat-induced reactions. However, buttercream remains fascinating from a scientific standpoint.
“Buttercream functions as an emulsion,” Patterson noted. “It contains an emulsifier, a unique molecule that binds water and oil. In butter, this role is played by casein, which keeps the fat and water components united.”
The slight crunch in certain buttercream frostings arises from an excess of solid sugar relative to the liquid content. Only a limited amount of sugar can dissolve in the water and fat mixture, leaving undissolved sugar grains suspended in the frosting. However, achieving smooth buttercream is simple with liquid sweeteners. “The casein in butter allows us to incorporate more water-based ingredients while maintaining stability. You can use honey, maple syrup, or even corn syrup, which offers a neutral base for custom flavors.”
