dynamic surface tension

Synonym: dynamic interfacial tension
https://doi.org/10.1351/goldbook.D01875
In certain circumstances, one may measure surface tensions that are different from the equilibrium value. Such a surface tension is called the dynamic surface (or interfacial) tension (γdyn or σdyn). The equilibrium value is then called the static surface (or interfacial) tension (γst or σst). The modifying signs may be omitted if there is no danger of ambiguity.
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 597 [Terms] [Paper]