ABSTRACT
The specific surface area SW of a powder is one of the basic properties of the powder. This value represents the internal and external surface area of total particles contained in a unit mass of powder, which can be measured using various probes, such as gases and liquids. The surface area of powder is generally determined by the gas adsorption method. In this case, it is necessary to obtain the monolayer capacity and cross-sectional area of an adsorbate molecule. The surface area of a powder can be determined by measuring the pressure drop during fluid flow through a packed powder bed. The Brunauer–Emmett–Teller equation was proposed, and has been used as a highly reliable method to determine the specific surface area without a modification of the equation. Real time permeametry is one of the examples taking advantage of characteristics of rapid measurement.
