SURFACE AREA OF CALCINED LIMESTONES OBTAINED BY NITROGEN ADSORPTION AND MERCURY PENETRATION MEASUREMENTS.

Two sets of limestones, one from Kentucky and one from Spain, have been used in a study to compare the surface areas from nitrogen adsorption and mercury penetration. As a first approximation for the higher area materials, the surface areas obtained by the two experimental methods are in reasonable agreement and either method could be employed. However, a consistent trend is established when the ratio of surface areas are considered for decreasing nitrogen. The mercury penetration area becomes increasingly greater than the nitrogen area as the nitrogen area becomes smaller.