How can something subatomic blow bubbles in a chamber?
What phenomena are you thinking about? Bubbles created during boiling of water?
The bubble blowing phenomenon I would say...
How does the sphere close?
The soap molecules are attracted to one another causing hole made when detaching from the pipe to shrink and disappear completing the bubble. The bubble seeks to minimize its surface area and so tries to become a sphere.
Like in a bubble chamber you mean?
The particles that leave tracks in the bubble chamber do not blow the bubbles.
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