Briefly explain the separation methods based on surface activity.

Separation methods based on surface activity utilize the differences in surface properties of substances to separate them from one another. The most common techniques in this category include flotation, foaming, and surfactant-based separations.

Flotation is a process where hydrophobic (water-repelling) particles are selectively separated from hydrophilic (water-attracting) particles. In this method, a mixture of solids or liquids is ___ ___ _________ ____ _______.
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