wetting tension (work of immersional wetting per unit area)

https://doi.org/10.1351/goldbook.W06674
The work done on a system when the process of @[email protected] involving unit area of phase β is carried out reversibly: \[w_{\text{W}}^{\unicode[Times]{x3B1} \unicode[Times]{x3B2} \unicode[Times]{x3B4} }=\gamma ^{\unicode[Times]{x3B2} \unicode[Times]{x3B4} }- \gamma ^{\unicode[Times]{x3B1} \unicode[Times]{x3B2} }\] where \(\gamma ^{\unicode[Times]{x3B1} \unicode[Times]{x3B2} }\) and \(\gamma ^{\unicode[Times]{x3B2} \unicode[Times]{x3B4} }\) are the @[email protected] between two bulk phases α, β and β, δ, respectively.
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 598 [Terms] [Paper]