Multiple choice

Liquid drops and bubbles acquire spherical shape due to the phenomenon of ______.

  1. capillary

  2. surface tension

  3. gravitational effect

  4. none of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Surface tension is the property of liquid surfaces to shrink to the minimum possible area. For a given volume, the shape with minimum surface area is a sphere. This is why liquid drops and bubbles naturally acquire spherical shapes - surface tension minimizes the surface area.

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