First slide

Surface tension and surface energy

Question

Water does not wet an oily glass because

Moderate

A

Cohesive force of oil >> adhesive force between oil and glass
B

Cohesive force of oil > cohesive force of water
C

Oil repels water
D

Cohesive force for water > adhesive force between water and oil molecules

Solution

Water does not wet an oily glass, because of, Cohesive force for water > adhesive force between water and oil molecules.

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