A square plate of glass of side 7.2 cm and thickness 2 mm has its thin edge touching a liquid surface. If the surface tension of the liquid is 20 dyne/cm , the force of surface tension on the glass plate is
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Surface tension acts along the length and thickness of the glassplate. Total length where ST acts =2l+2t=20cm
Total pulling down force =20×60=1200 dynes
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It has no component perpendicular to the horizontal surface. As a result, there is no pressure difference between the liquid side and the vapour side. ... Thus, there is always an excess of pressure on the concave side of a curved liquid surface over the pressure on its convex side due to surface tension.
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