Question: A film of ethanol at 20C has a surface tension of 22.3 mN/m and is maintained on a wire frame as shown in Fig. P4.73.

A film of ethanol at 20°C has a surface tension of 22.3 mN/m and is maintained on a wire frame as shown in Fig. P4.73. Consider the film with two surfaces as a control mass and find the work done when the wire is moved 10 mm to make the film 20 × 40 mm.

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