⦿ Chapter : Surface Tension ⦿ Topic : When two soap bubbles of different radii come into contact with each other, what will be the radius of interface of two soap bubbles ?
When two soap bubble will come in contact then contact area will be bulge towards the bigger sphere. excess pressure inside the smaller soap bubble will be greater as compared to the bigger sphere.
If pressure inside bigger bubble is P1 and inside smaller bubble is P2 ,
net pressure acting on the interface will be
P = P1-P2
or, 4S/r = 4S/r1 - 4S/r2
∴ r = r1r2/ r2- r1
This is the radius of the interface of two soap bubbles which are in contact