A frame made of metallic wire enclosing a surface area A is covered with a soap film. If the area of the frame of metallic wire is reduced by 50% , the energy of the soap film will be changed by

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Surface energy = surface tension × surface area E = T × 2 A New surface energy, E 1 ​ = T × 2 ( 2 A ​ ) = T × A % decrease in surface energy ​ = E E − E 1 ​ ​ × 100 = 2 T A 2 T A − T A ​ × 100 = 50% ​

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