Vp 6Ynjdjn dj trp 6End

Enjd'j In dj Unjdj

Because mass and volume are directly related, with p as the constant of proportionality, the expression for the geometric volume mean diameter, D v, is the same as that for DgM given in Eq. (H). _

Similarly, the geometric surface mean diameter, D s, is defined as the average diameter weighted according to the surface areas s- in the various groups:

ILnjdj In dj Unjdj

using area ird2 and where .ST is the total surface area of all particles in all groups.

The surface mean diameter (as opposed to the geometric surface mean diameter) is also a very useful parameter, since

Lnjdj Lnjdf

6 Mt

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