where, DSauter is the average diameter of Sauter (mm), Dmi is the arithmetic average diameter between two screens (mm) and Xi is weight fraction of particle size Dmi (%).
For the sphericity determination, the geometric dimensions of papaya seeds, x, y and z, were measured (Vernier Caliper 150 mm with precision of 0.02 cm) and the following equation was applied
(Mohsenin, 1980):