The vapour pressure over the concave surface is ______
Vapour Pressure Over Concave Surface
The relationship between vapour pressure and the curvature of a liquid surface is governed by surface tension effects.
Considerations:
- Surface Tension: Liquid surfaces exhibit surface tension, acting like a stretched membrane. This causes a net inward pull on surface molecules.
- Concave Surface: In a concave surface, the net effect of surface tension and molecular interactions makes it easier for molecules to escape into the vapour phase compared to a plane surface. Alternatively, the pressure difference across the interface (related to Young-Laplace equation) leads to lower vapour pressure.
- Result: This increased tendency for evaporation leads to a lower equilibrium vapour pressure over the concave surface.
Therefore, the vapour pressure over the concave surface is less than the vapour pressure over the plane surface.
Important Questions from Surface Tension
Which of the following statements is NOT correct about surface tension?
If a liquid droplet and a soap bubble are formed from the same liquid and have the same radius $R$, how does the excess pressure inside the soap bubble ($\Delta P_{bubble}$) compare to the excess pressure inside the liquid droplet ($\Delta P_{droplet}$)?
Mercury does NOT wet the glass. This is due to the property of the liquid known as
________ is a surface phenomenon.
A liquid drop is spherical in shape due to
