Let a wire of length l, diameter d be loaded by force F.
Let dl be the change in length and dV the change in volume, and dD be the change in the diameter.
Volume of wire before the force is applied is,
Volume of wire after the force is applied is,
Change in volume is,
dV = V' - V
Adhesive force is the attractive force between two unlike molecules. They are caused by forces acting between two substances like electrostatic force (attraction due to opposing charges), mechanical force etc.
E.g., Force of attraction between gum and paper.