Physics
Small bubbles are perfectly spherical because of
Gravity
Pressure
Viscosity
Surface tension
Surface tension
Surface tension is responsible for the shape of liquid droplets. Although easily deformed, droplets of water tend to be pulled into a spherical shape by the cohesive forces of the surface layer. In the absence of other forces, including gravity, drops of virtually all liquids would be perfectly spherical. The spherical shape minimizes the necessary โwall tensionโ of the surface layer according to Laplaceโs law.
Surface tension Surface tension is responsible for the shape of liquid droplets. Although easily deformed, droplets of water tend to be pulled into a spherical shape by the cohesive forces of the surface layer. In the absence of other forces, including gravity, drops of virtually all liquids would be perfectly spherical. The spherical shape minimizes the necessary โwall tensionโ of the surface layer according to Laplaceโs law.
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