  The wetting of solid surfaces by fluids is a problem of great practical
importance that has been extensively studied over the years. Most often, the
experimental work has involved measurements of the contact angle made by a
liquid on the solid surface of interest. Young's equation gives the relation
between the contact angle and the interfacial tensions. An alternative to the
contact angle computation is the more generally applicable formulation of this
problem based on simulations (and measurements) of adsorption isotherms for a
fluid on a weakly interacting solid surface. We present some GCMC computations
for the case of heterogeneous surfaces.
