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Porosity or void fraction is a measure of the void ... There are many ways to test porosity in a substance or part, ... equation: [3] () = where, () is the ...
A force balance equation known as Washburn's equation for the above material having cylindrical pores is given as: [1] ... Porosity; Wood's metal, ...
The porosity is a measure of the total pore space in the soil. This is defined as a fraction of volume often given in percent. The amount of porosity in a soil depends on the minerals that make up the soil and on the amount of sorting occurring within the soil structure.
Web-based porosity and permeability calculator given flow characteristics; Multiphase fluid flow in porous media; Florida Method of Test For Concrete Resistivity as an Electrical Indicator of its Permeability Archived 2011-06-16 at the Wayback Machine
Measurement consists of packing the powder into a cylindrical "bed" having a known porosity (i.e. volume of air-space between particles divided by total bed volume). A pressure drop is set up along the length of the bed cylinder. The resulting flow-rate of air through the bed yields the specific surface by the Kozeny–Carman equation: [1]
where is the void ratio, is the porosity, V V is the volume of void-space (gases and liquids), V S is the volume of solids, and V T is the total (or bulk) volume. This figure is relevant in composites , in mining (particular with regard to the properties of tailings ), and in soil science .
Hair porosity refers to how your hair handles hydration and you can have high porosity hair or low porosity hair. This test will help you figure out which type you are and what products to use.
This porosity is related to a number of important properties of the material, including the strength and permeability, which in turn affect the properties of the resulting concrete. Measurement of the specific surface area using the BET method is useful for comparing different cements.