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Question
A molecule of water on the surface experiences a net ______.
Options
downward resultant unbalanced adhesive force
upward resultant unbalanced cohesive force
downward resultant unbalanced cohesive force
upward resultant unbalanced adhesive force
MCQ
Fill in the Blanks
Solution
A molecule of water on the surface experiences a net downward resultant unbalanced cohesive force.
Explanation:
Due to the net number of molecules tugging it in the downward direction (molecule A in the picture below), a molecule on the surface experiences a net force (Cohesive force) in the downward direction.
A molecule well inside, on the other hand, is equally tugged in all directions by molecules around it (molecule Bas in picture).
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Molecular Theory of Surface Tension
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