A small drop of liquid is squeezed between two flat plates to form a thin disc...

 

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A small drop of liquid is squeezed between two flat plates to form a thin disc of height H and diameter D. The contact angle of the liquid interface at the solid surfaces is zero, so that the perimeter of the liquid disc has a concave radius of curvature in the plane normal to the disc, as shown in the above figure. What are the principal radii of curvature of the interface at the edge of the liquid disk between the solid plates? A small drop of liquid is squeezed between two flat plates to form a thin disc of height H and diameter D. The contact angle of the liquid interface at the solid surfaces is zero, so that the perimeter of the liquid disc has a concave radius of curvature in the plane normal to the disc, as shown in the above figure. What are the principal radii of curvature of the interface at the edge of the liquid disk between the solid plates?

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The description mentions that the perimeter of the liquid disc has a concave radius of curvature In ... View the full answer