Chapter:

Properties-of-fluid

If surface tension at air-water interface is 0.069 N/m, What is pressure difference between inside and outside of an air bubble of diameter 0.009 mm?

SOLUTION:

Given,

Surface Tension,`sigma=0.069`N/m

Diameter of air bubble,`d=0.009`mm

Since an air bubble has only one surface,

`P*(pi*d^2)/4=sigma*pi*d`


or,`P=(4*sigma)/d=30667`N/`m^2`

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