5.4 Calculating Properties Of Solids !!hot!! -
From experimental and theoretical density: $$ P = \left(1 - \frac\rho_exp\rho_th\right) \times 100% $$ $P$ can be closed (isolated pores) or open (interconnected pores), affecting permeability.
Write the generic formula down on your paper. It saves you from simple errors. 5.4 calculating properties of solids
Think of Surface Area ($SA$) as the amount of gift wrap you need to cover a box. It is the total area of all the faces (surfaces) of a solid. From experimental and theoretical density: $$ P =