The gauge pressure due to liquid at the depth h=5cm=0.05m is, P=ρgh P=1000×10×0.05 P=500Pa The excess pressure inside the bubble with relative to outside due to surface tension, pe=
2σ
R
Substitute the values in the above equation. pe=
2×0.1
0.002
=100Pa The next excess pressure inside the bubble with respect to surface of liquid, ptotal=p+pe ptotal=500+100 ptotal=600Pa