Hysteresis in sorption—X

In a system of closely packed spherical particles, formation of two different types of capillaries cavities and open pores—is indicated. Assuming spherical particles of equiradius, the volume of an open pore is calculated in relation to particle radius. The total open pore is calculated in relation to particle radius. The total open pore volume just as the total cavity volume, decreases as the particle radius increases. The ratio of the open pore volume to the cavity volume increases as particle radius increases. The value of this ratio when the particle radius is increased to the maximum limit at which the whole mass consists of four spheres producing a cavity and four open pores is twice the value when the particle radius tends to the limiting value of zero.