Bursting of A Soap Film
If a soap film is unstable, it ends by bursting. A hole is created somewhere in the film and opens very rapidly. Surface tension indeed leads to surface minimization and, thus, to film disappeance. The hole operture is not instantaneous and is slowed down by the liquid inertia. The balance between both forces (inertia and surface tension) leads to the opening velocity: where is the liquid surface tension, is the liquid density and is the film thickness.
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