Under the following conditions, determine the pressure difference inside a hydrogen bubble that

creates the hydrogen$-$water interface at $30$deg C: $($a$)$ The diameter of the bubble is D$=0\mathrm{.}01$ mm$.($b$)$

The surface tension of air$-$water and hydrogen$-$water interface is approximately same. At $30$deg C$,$

the surface tension of the air$-$water interface is $0\mathrm{.}0712$ N$/$m Also, determine the pressure difference

if the hydrogen bubble is created by two surfaces like soap bubble

I need help to slove A and B