Question: what is the formula used for calculating particle size?
Answer: particle size: xn+1) is divided intonseparate intervals, and each of these particle size intervals is taken to be [xi, xi+1] (j = 1,2,.... n). The element of q qj(j= 1,2,....n) is the particle amount corresponding to the particle size interval [xi, xi+1]. Normally, the volume standard is used.