Given the task definition and input, reply with output. In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.

Otto Stern proposed a slipping plane in these systems, at which ions with non-negligible volume adsorb to a surface, modifying the Helmholtz and Gouy-Chapman models. These systems are stabilized through the addition of a salt, called peptization. Because these materials effectively scatter light with low wavelengths, they often appear blue when light is shined through them in the Tyndall effect. Flocculation disrupts these systems, which are defined to be dispersions with particle diameter between a nanometer and a micrometer. For 10 points, name these systems of in which one substance is dispersed throughout another, exemplified by foams, emulsions, and aerosols.
Science