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Laplace law will give you the curvature of the surface for a given pressure in the film, which you can integrate to get the shape... provided you know the volume of fluid that remains in the slit. I believe the volume of fluid itself will be dependent on the dynamics of the process of getting the frame out of the water, and also on the frame itself: its ...


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The simple answer to "why is the pressure inside a soap bubble higher than outside," is that a higher pressure than the local atmosphere is required to make the bubble in the first place! This requirement comes from the need to counterbalance the surface tension force. For stable conditions, $$F_i = F_o + F_s $$ Where $F_i$ is the force due to inside ...



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