Prob. $2$

Determine the specific surface $\backslash ($ s $\backslash )$ and porosity $\backslash (\backslash$epsilon $\backslash )$ of a porous medium that is a rectangular slab of length $\backslash ($ L $\backslash ),$ and cross$-$sectional dimensions of width $\backslash ($ B $\backslash )$ and height $\backslash ($ A $\backslash ).$

$($A$)$ Assume this volume is filled with solid spheres of radius $\backslash ($ r $\backslash ),$ and there are $\backslash ($ n$\_\{$s$\}\backslash )$ total number of spheres in the slab.

$($B$)$ Assume this volume is filled with small cylindrical objects of radius $\backslash ($ r $\backslash )$ and length $\backslash ($ l $\backslash ),$ and there are $\backslash ($ n$\_\{$s$\}\backslash )$ total number of cylinders in the slab.