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Experiments on suspensions of glass beads in electrolytes indicate that Bruggemann's approximation represents the dependence of effective conductance on volume fraction very satisfactorily when the dispersed phase contains a broad range of particle sizes. Data on narrow size ranges fall in between values predicted by the Maxwell and Bruggemann equations. These findings are consistent with the physical assumptions implicit in both theoretical developments.
Rue et al. (Thu,) studied this question.