First slide

Surface tension and surface energy

Question

If two soap bubbles of equal radii r coalesce then the radius of curvature of interface between two bubbles will be

Moderate

A

r
B

0
C

Infinity
D

1/2r

Solution

$r = \frac{r_{1} r_{2}}{r_{2} - r_{1}} = \infty \sin ce r_{1} = r_{2}$

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