What should be the pressure inside a small air bubble of `0.1 mm` radius situated just below the surface of water? Surface tension of water `=72xx10^(-3)N//m` and atmospheric pressure `=1.013xx10^(5)N//m^(2)`

Explanation

Excess pr. `P_(ex)=(2T)/(r)`
`P_(ex)=(2xx72xx10^(-3))/(1xx10^(-3))=1440N//m^(2)`
For air bubble in water as on free surface since the buble is just below the water surface the external pressure on it is equal to the atm pressure P hence the pressure inside the bubble.
`P+P_(ex)=1.013xx10^(5)+1440`
`=1.0274xx10^(5)N/m^(2)`