Foaming

The accumulation of many small bubbles on or in a liquid. Foaming is desirable in foods such as whipped cream, meringues and beer heads, where proteins stabilise the bubble films, but problematic in processing — e.g. during evaporation or fermentation — where foam can overflow equipment and reduce efficiency. In processing, foam is suppressed with food-grade antifoams (silicone or oil-based) or mechanical breakers, since uncontrolled foam in fermenters or evaporators cuts capacity and risks contamination. In products, foam stability — drainage, disproportionation, coalescence — is engineered through protein-polysaccharide interactions and measured as a quality attribute.