defined as Rnid4
i =Rnid3
i
(where ni is the number of fat globules of diameter di), the volume–
surface average diameter d32, defined as Rnid3
i =Rnid2
i , the modal
diameter, which corresponds to the population of fat globules most
present in the size distribution and the specific surface area
S = 6.u/d32 (where u is the volume fraction of milk fat).