Foam stability refers to the ability of a foam to maintain its structure and resist collapse over time. Foams are made up of gas bubbles trapped in a liquid or solid matrix, and their stability is influenced by factors such as the properties of the liquid, the size of the bubbles, and the presence of surfactants. In many applications, such as in food products, cosmetics, and industrial processes, stable foams are essential for performance. For example, in whipped cream, a stable foam helps retain air and maintain texture, while in firefighting, stable foams can effectively smother flames.