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It becomes a circle.

Why does the thread become a circle?

The soap or detergent spreads out over the surface of the water and reduces the surface tension inside the loop, but not outside. The detergent wants to cover as much surface area on top of the water as possible – for a given area coated with detergent, the circle has the smallest possible circumference OR for a given perimeter the circle encloses the largest possible surface area.

What would happen if detergent were added to the outside of the loop rather than the inside?

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