Which function uses beaten whites to increase volume, as in angel food cake?

Which function uses beaten whites to increase volume, as in angel food cake?

• A. Binder
• B. Foams
• C. Leavening
• D. Emulsifier

Answer: (C)

Beating egg whites creates a stable foam that traps air. As the cake bakes, the heat expands that air and the proteins set around it, giving the batter lift and a light, airy crumb. This lifting action is the leavening function—using air to increase volume. Angel food cake relies on pure egg white foam to rise, with sugar helping stabilize the bubbles and no fat to weigh the structure down. Other roles aren’t about rising: a binder holds ingredients together, an emulsifier helps fats mix with liquids, and foams describes the foam itself rather than the action that makes the batter grow.

Beating egg whites creates a stable foam that traps air. As the cake bakes, the heat expands that air and the proteins set around it, giving the batter lift and a light, airy crumb. This lifting action is the leavening function—using air to increase volume. Angel food cake relies on pure egg white foam to rise, with sugar helping stabilize the bubbles and no fat to weigh the structure down. Other roles aren’t about rising: a binder holds ingredients together, an emulsifier helps fats mix with liquids, and foams describes the foam itself rather than the action that makes the batter grow.