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Why does surface tension act only on the boundary of a drop?

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Surface tension is defined as the force on molecules on one side of a line imagined on the free surface by the molecules on the other side of the line. read more

SURFACE TENSION. SURFACE - The interface between two media or materials. Normally its the outside of the drop at the liquid air interface. TENSION - Force acting. Thus surface tension is the force acting on the outer surface/boundary of the drop. read more

In the pendant drop test, a drop of liquid is suspended from the end of a tube by surface tension. The force due to surface tension is proportional to the length of the boundary between the liquid and the tube, with the proportionality constant usually denoted . Since the length of this boundary is the circumference of the tube, the force due to surface tension is given by = where d is the tube diameter. read more

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Surface Tension Basics
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What Is Surface Tension?
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