The specific surface area in bulk granular materials can also be thought of as the total inner surface area exposed to a gas or fluid flowing through the porous material. In fact, specific surface is an important property that governs the degree of permeability (ease of fluid flow through pores) of a porous bulk material.For example,measurement of gas flow rate and pressure drop through a powder sample enables calculation of the gas permeability of the powder, and in turn, the specific surface area per unit of bulk volume if porosity of the powder is known. This method of gas permeability is most useful to estimate the specific surface area in a sample of bulk material like agricultural grains and silage, ground meals, food powders and powdered ingredients.
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