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Find the pressure inside on air bubble o...

Find the pressure inside on air bubble of radius 0.1 mm just inside the surface of water. Surface tension of water = 72 dyn. `cm^-1`.

Text Solution

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Excess pressure inside an air bubble
`(2T)/(r )=(2xx72)/(0.01)`
`[because T=72 dyn. Cm^-1 and r 0.01 mm= 0.01 cm]`
`=14400 dyn. Cm^-2`.
Atmospheric pressure `=76xx13.6xx980 dyn. Cm^-2`
`therefore` Total pressure inside an air bubble
`=(76xx13.6xx980+14400)`
`=1.0274xx10^6 dyn. cm^-2`.
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