The invention relates to a liquid composition measurement method. One embodiment of the method comprises the steps of: i) subjecting a liquid composition containing fine particles and a solvent to the following pretreatment steps (a) to (c) to form an agglomerate of fine particles: (a) evaporating the solvent of the liquid composition at 120° C. for 10 hours in an ambient atmosphere, and drying the liquid composition; (b) burning the dried liquid composition resulting from the pretreatment step (a) at 700° C. after raising the temperature from 120° C. to 700° C. over one hour; (c) cooling a burned product obtained in the pretreatment step (b) to room temperature, powdering the burned product to obtain agglomerates of the fine particles; and ii) vacuum degassing the agglomerates at 120° C. for 8 hours, and measuring physical properties of pores of the agglomerates by a nitrogen adsorption and desorption method.