Explanation There will be two gas-liquid contacts in the soap bubble. Write the formula to calculate surface tension work to expand the soap bubble ( W surface ) . W surface = 2 ∫ 1 2 σ s d A = 2 σ s ( A 2 − A 1 ) = 2 σ s ( π d 2 2 − π d 1 2 ) (I) Here, surface tension is σ s , change in surface area of the film is d A , surface areas of the two surfaces are A 1 and A 2 respectively and diameters of the two surfaces are d 1 and d 2 respectively. Conclusion: Substitute 0 .005 lbf / ft for σ s , 3 .0 in . for d 2 and 0 .5 in . for d 1 in Equation (I). W surface = 2 ( 0 .005 lbf / ft ) ( π ( 3 .0 in

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ISBN: 9780073398174

Author: Yunus A. Cengel Dr., Michael A. Boles

Publisher: McGraw-Hill Education

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Chapter 2.8, Problem 32P

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The surface tension work required to expand the soap bubble.

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Chapter 2.8, Problem 31P

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