what is free surfaces In soap bubble?
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The free surface of a liquid just means the surface that is in contact with air. ... If you are on the topic of surface tension, then a soap bubble has two free surfaces, the outside and the inside. these are free surfaces that are in contact with air. A bubble inside a liquid has one free surface.
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- Picture a soap bubble. The surface tension balances the outward force due to the pressure difference between the inside and the outside air. We have two surfaces, the inner and the outer surface of the bubble. ... The force do to the pressure difference must balance the force from the surface tension.
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