Air in meringues, soufflés, and sponge cake is not merely trapped gas; it is a protein foam that must hold its shape until heat sets it. In this guide, you will learn how egg whites form that structure, why sugar, acid, temperature, and mixing control stability, and how timing and gentle handling help prevent collapse.
Essential Concepts
Whipped egg whites make a foam.
Stability depends on proteins, sugar, acid, heat, and careful mixing.
Fat, overwhipping, and delay before baking weaken rise.