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How much amount of work is done in forming a soap bubble of radius r?q2

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Let T be the surface tension of a soap solution.

The initial surface area of soap bubble = 0

The final surface area of soap bubble = 2 × 4πr2

∴ The increase in surface area = 2 × 4πr2

The work done in blowing the soap bubble is

W = surface tension x increase in surface area

=T × 2 × 4πr2 r2T

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