Coatings used on raincoats are waterproof bec | vedclass

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Question

(B) surface is considered waterproof if it prevents water from passing through it. Raincoats are designed to be impermeable to water.Water wets a surf

Vedclass · Accepted Answer

Cohesive force becomes greater

Vedclass · Answer

(B) surface is considered waterproof if it prevents water from passing through it. Raincoats are designed to be impermeable to water.Water wets a surface when the adhesive force between water molecules and the surface molecules is stronger than the cohesive force between the water molecules themselves.Conversely,if the cohesive force between water molecules is significantly stronger than the adhesive force between water molecules and the surface material,the water will not wet the surface.In the case of a raincoat,the coating material is chosen such that the adhesive force between the water and the coating is very weak. Because the cohesive force within the water molecules is much greater than this adhesive force,the water beads up and rolls off rather than spreading out and wetting the fabric. Therefore,the waterproof nature is due to the cohesive force being greater than the adhesive force.

Coatings used on raincoats are waterproof because

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