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In the image that I've attached with this thread you can see proof of surface energy+surface tension. This scaned image is from my school book. When I was going through this topic I wound that in this increase in surface area = 2lx which according to me isn't reasonable. I discussed about it mwith my teacher but I'm not satisfied with his answer. According to me increase in surface area should be = lx. Please post your comments on this
In this question there are two surfaces of the soap film. The increase in the area of the soap film=lx+lx=2lx.
lx is the increase in the area of one surface.The other surface has also a length equal to l and width equal to x
Therefore net increase in the surface area of the soap film=2lx
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