UPSEE Solved Model Paper 1

Pressure outside the bubble in liquid
Pd = P0+pgd

Pressure difference between inside and outside of the air bubble = 2T/r
⇒ Pinside = Poutside+

2T

r

= (P0+ρgd)+

2T

r

Note:
A bubble of air within a liquid has only one liquid-air surface and the excess pressure within such a bubble is simply: 2T/r.