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s). Taking logs of both sides of this equation, differentiating with respect to s, and multiplying by -1, we get Substituting for T, 7 3 , and 7 5 from Equations ( B l 6 : to (B18) and solving the resulting equation for Mo yield (B7) Mo = MO' -(n + t2 + Y + .%a) coal, which produces fly ash of lower electrical conductivity (vis a vis higher sulfur coal), the phenomenon and mechanism of such conditioning remain poorly understood beyond the general rationale that they are associated with gas sorption phenomena and attendant ionic conduction either within the ash particles, at their surfaces, or at both locations. The present paper reports experiments relating the electrical resistivity of fly ash to gas sorption phenomena. In particular, a simple model has been developed which, for the first time, explains the rather extraordinary influence of temperature, gas moisture content, and concentration of conditioning agent upon the electrical resistivity of the fly ash. X n this approach, the fly ash layer is represented by a well-ordered cubic array of monodisperse, spherical particles, wherein capillary condensation of water and conditioning agent occurs in the narrow crevices at the points of contact between the particles. Increased conductivity results from the added conduction path provided by the capillary condensed liquid. The conditioning agent actually enhances the extent of capillary condensation and thus the conductivity.