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Statement of a problem № 572

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The surface of a soap film was increased isothermally by ds at a temperature T. Knowing the surface tension of the soap water solution a and the temperature coefficient da/dT, find the increment (a) of the entropy of the film's surface layer; (b) of the internal energy of the surface layer.

Solution:
The surface of a soap film was increased isothermally by ds at a temperature T.

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