Question

If the surface tension of soap solution is sigma what is the work done in blowing soap bubble of radius r

Answer 1

Answer:$W = \sigma \times 8\pi r^{2}$

Explanation:

Given that,

Surface tension $T = \sigma$

Radius = r

We know that, a bubble has two surface in contact with air so, the total surface area of the bubble is

$A = 2\times 4\pi r^{2}$

We know that,

The work done is

$W = T\times A$

$W = \sigma \times 8\pi r^{2}$

Hence, this is the required solution.