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Physisorption

A soap film i...

Question

A soap film is on a rectangular wire ring of size 5cm×4cm .If the size of the film is changed to 5cm×5cm,then calculate the work done in this process. The surface tension of soap film is 5×10^-2Nm-1

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Solution

Simple
find area then
The soap film has two free surfaces.

The expression for work done is,

W=2T(A2−A1)
=2×0.05(25−20)×10−4
=5×10−5 J

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