Discussion
Water repellency of a fabric is achieved by
Answer: D
Correct answer: lowering the surface energy of the fibres
Repellency is a surface energy effect: a finish with a lower surface energy than the liquid prevents the liquid spreading, so a drop beads up and rolls off. The interstices are deliberately left open, which is what distinguishes a repellent fabric from a waterproof coated one - the first still breathes, the second does not.
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