The rapid growth of interest in powders and their surface properties in
many diverse industries prompted the writing of this book for those who
have the need to make meaningful measurements without the benefit of
years of experience. It is intended as an introduction to some of the
elementary theory and experimental methods used to study the surface
area, porosity and density of powders. It may be found useful by those
with little or no training in solid surfaces who have the need to
quickly learn the rudiments of surface area, density and pore-size
measurements. Syosset, New York S. Lowell May, 1983 J. E. Shields Xl
List of symbols Use of symbols for purposes other than those indicated
in the following list are so defined in the text. Some symbols not shown
in this list are defined in the text. d adsorbate cross-sectional area A
area; condensation coefficient; collision frequency C BET constant c
concentration D diameter; coefficient of thermal diffusion E adsorption
potential f permeability aspect factor F flow rate; force; feed rate 9
gravitational constant G Gibbs free energy GS free surface energy h heat
of immersion per unit area; height H enthalpy Hi heat of immersion Hsv
heat of adsorption BET intercept; filament current k thermal
conductivity; specific reaction rate K Harkins-Jura constant I length L
heat of liquefaction M mass M molecular weight n number of moles N
number of molecules; number of particles N Avagadro's number .
