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Water remains as drops on the polythene ...

Water remains as drops on the polythene surface but, it forms a thin layer on the surface of a properly cleaned glass plate. Explain.

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(i) cohesive, adhesive forces
(ii) composition of polythene
(iii) composition of glass
(iv) forces between water and polythene
(v) forces acting between water and glass
(vi) comparison of these forces
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