COALESCENCE (Latin coalescere to grow together, connect) — the merge of drops of liquids in emulsions and fogs, bubbles in foams happening in the disperse systems consisting only of fluid phases. With a concept K. questions of stability of foams, emulsions and aerosols as meeting in nature, and used in pharmaceutical and medical practice are closely connected. To. foams can cause alcohols (e.g., octyl), ketones (acetone) and many other low-molecular surfactants which do not form enough strong structured top skins that is used, e.g., at analytical definition of amino nitrogen according to Van-Slayka (see. Van-Slayka methods ), in biochemical, analyses and in other cases.
Bibliography: Voyutsky S. S. Course of colloid chemistry, M., 1975; Greene X. and Lane V. Aerosols — dust, smokes, fogs, the lane with English, L., 1969, bibliogr.; Emulsions, the lane with English, under the editorship of A. A. Ab-ramzon, L., 1972.
I. N. Putilova.