Polymer scientists use thermodynamics to describe how the different blocks interact. The product of the degree of polymerization, "n", and the Flory-Huggins interaction parameter, formula_5, gives an indication of how incompatible the two blocks are and whether or not they will microphase separate. For example, a diblock copolymer of symmetric composition will microphase separate if the product formula_6 is greater than 10.5. If formula_6 is less than 10.5, the blocks will mix and microphase separation is not observed. The incompatibility between the blocks also affects the solution behavior of these copolymers and their adsorption behavior on various surfaces.