Nevada Barber Practice Exam 2024 - Free Barber Practice Questions and Study Guide.

Emulsions are closely associated with the suspension of one liquid within another. As a surfactant, hydrophilic molecules are attached to the surface of the droplets, making the interaction between the two liquids more stable. Catalysts help to speed up chemical reactions, binders hold multiple ingredients together in a formulation, and preservatives inhibit the growth of microorganisms. None of these options directly aid in holding an emulsion together like a surfactant does.