I know the mass of N porous particles and their mean diameter.
The volume of the particles is N
porous particles, PI is 3.14159... and Dp is the mean particle diameter.
To which kind of density the ratio mass/volume so obtained corresponds?
I need to determine the porous particle density (including pores) and I know
the pore volume (in cc/gram).

***(PI***Dp^3)/6, where N is the number of