A liquid does not wet the solid surface if the angle of contact is

A liquid does not wet the solid surface if the angle of contact is
  1. zero
  2. equal to $45^{\circ}$
  3. equal to $90^{\circ}$
  4. greater than $90^{\circ}$

Solution

A liquid does not wet the solid surface if the angle of contact is obtuse ie, greater than $90^{\circ}$. In this case cohesive forces will be greater than adhesive forces and so, the liquid does not wet the surface of solid.

Asked in: AP EAMCET 2007

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