If adsorption equilibrium and mutual saturation of the phases is not achieved instantly, it is possible to distinguish the initial spreading tension, σ_i^αβδ, from the final spreading tension, σ_i^αβδ, when equilibrium has been reached. In the case in which σ_i^αβδ is positive, while σ_i^αβδ is negative, the system is said to exhibit autophobicity.
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 598 (