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Why are bubbles always round?


Bubbles are round — spherical — because there is an attractive force called surface tension that pulls molecules of water into the tightest possible groupings. In a bubble, the inward surface-tension forces of the water film are exactly balanced by the outward-pushing pressure of the air inside.

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The balance of forces inherent in the surface of a bubble (surface tension and inner and outer pressures) yield a spherical shape. Any shape other than a sphere requires additional forces to act upon the bubble.

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