rupture

of a thin film
https://doi.org/10.1351/goldbook.R05428
The formation of a hole which permits @C01119@ or direct contact of the two phases which it separates.
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 613 [Terms] [Paper]