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78. Problem 17.51 (RHK) How much surface energy is stored in the surface of a soap
bubble 2.1 cm in radius if its surface tension is
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Solution: Click For PDF Version An equivalent definition of surface tension is surface energy per unit area. A soap bubble has two surfaces one outer and the other inner
each of area
Therefore, the surface energy stored in a soap bubble of radius 2.1 cm is
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where
r is the radius of the bubble.