Why do bubbles always form spheres?
Show answer & explanation
Answer: Surface tension minimizes area
Surface tension minimizes area ✓ — Correct! Surface tension pulls the soap film into the smallest possible shape for a given volume—a sphere. This minimizes surface energy, which is why free-floating bubbles are always round!
Air inside pushes equally — Wrong. While air pressure is equal inside, it's surface tension that creates the spherical shape.
Gravity pulls them round — Wrong. Gravity actually distorts bubbles slightly. In zero gravity, bubbles are even more perfectly spherical.