Excess pressure can be `(2T//R)` for

Options

A. spherical drop
B. spherical meniscus
C. cylindrical bubble in air
D. spherical bubble in water

Answer

A, B, C, D

Explanation

i. Excess pressure inside a sphereicla liquid drop `=2T//R`, because there is only one free surface here
ii. In case of sphereicla meniscus of radius of curvature `R` also excess pressure `=2T//R` because again there is only one free surface.
iii. Excess pressure inside a cylindrical drop of radius `R=T//R.` Hence, for a cylindrica bubble in air, excess pressure is `2T//R`, because there exist two free surface in this case.
iv for a spherical bubble in water, expressure pressure `=T//R` as there is only one free surface.