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Question

If drops and bubbles do not collapse under the effect of gravity, it indicates that _______________


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Solution

Excess pressure inside a liquid drop, a soap bubble, and an air bubble

  1. When a liquid comes into touch with a solid, its free surface curves, the amount of interfacial surface tension changes depending on the type of liquid-air or liquid-gas interaction.
  2. From the above figure, there is a differential in pressure between the inner and outer sides of the surface when the liquid's free surface is curved.
  3. Every molecule on a curved liquid surface is subject to forces (FT,FT) due to surface tension across the tangent to the surface, when these forces collapse into rectangular parts.
  4. As a result, the liquid's curved surface is related to the resulting force, which is normal to the surface, likely how the resultant force for a concave surface is directed away from the center of curvature, the resultant force for a convex surface is directed inwards towards the center of curvature. Therefore, the pressure on a curved liquid surface in equilibrium is higher.
  5. So, the small bubbles and liquid drops are spherical because of the forces of surface tension, because of the combined effect, a bubble or liquid drop should not collapse, showing that the pressure inside is greater than the pressure outside.

Hence, If drops and bubbles do not collapse under the effect of gravity, it indicates that pressure inside the drop is greater than outside it which prevents the collapse.


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