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I was recently observing the way bubbles move as they pop and disappear. I noticed that when bubbles destabilize and pop, the remaining bubbles immediately surrounding it will move to fill its place. I was wondering what the driving cause is here.
At first, I figured that stickiness was the cause. But, I don't think this would be a driving force unless perhaps the bubbles are clustered (i.e. they share at least 1 membrane).
I've also noticed this behavior in groups of individual, non-clustered bubbles. As an introductory physics student, I'm curious: what causes this phenomenon?