A @S06194@ which when present in small amounts facilitates the formation of a @F02467@, or enhances its @C01172@ stability by inhibiting the @C01119@ of bubbles.
Source: PAC, 1972, 31, 577. (Manual of Symbols and Terminology for Physicochemical Quantities and Units, Appendix II: Definitions, Terminology and Symbols in Colloid and Surface Chemistry) on page 612 [Terms] [Paper]