GeneralAnswersv1

Why are free soap bubbles round?

Surface tension favours the smallest surface area for an enclosed volume.

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Output
An approximately spherical bubble
Input
A flexible soap film enclosing air away from nearby surfaces
Relationship

What connects the input and output?

Molecules in the film pull along its surface. For a given enclosed volume, a sphere minimises area, so unequal curvature is smoothed toward that shape.

Sources

1
  1. www.britannica.com: Why are free soap bubbles round?www.britannica.com

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