A concise review of the concepts and techniques applicable to emulsions and dispersions useful to industrial chemists and chemical engineers. Describes a wide range of topics under the headings of particulates, interfaces, stability of dispersions, and dispersed-phase systems. Also covers recently-developed computer-based methods which offer fast, precise measurements, e.g. particle-size distributions by quasielastic light scattering, dilational surface elasticity from the damping of ripples, and foam stability by the automatic recording of small pressure differences.