Ratio of void volume and total volume of a porous material
Porosity or void fraction is a measure of the void (i.e. "empty") spaces in a material, and is a fraction of the volume of voids over the total volume, between 0 and 1, or as a percentage between 0% and 100%. Strictly speaking, some tests measure the "accessible void", the total amount of void space accessible from the surface (cf. closed-cell foam).
There are many ways to test porosity in a substance or part, such as industrial CT scanning.
The term porosity is used in multiple fields including pharmaceutics, ceramics, metallurgy, materials, manufacturing, petrophysics, hydrology, earth sciences, soil mechanics, rock mechanics, and engineering.[1]
^Mohammadizadeh, SeyedMehdi; Moghaddam, Mehdi Azhdary; Talebbeydokhti, Naser (2021). "Analysis of Flow in Porous Media using Combined Pressurized-Free surface Network". Journal of Porous Media. 24 (10). Begel House Inc.: 1–15. doi:10.1615/JPorMedia.2021025407. S2CID 235877042.
Porosity or void fraction is a measure of the void (i.e. "empty") spaces in a material, and is a fraction of the volume of voids over the total volume...
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Gas porosity is the fraction of a rock or sediment filled with a gas. Determining the true porosity of a gas filled formation has always been a problem...
must be eliminated. They are broken down into five main categories: gas porosity, shrinkage defects, mould material defects, pouring metal defects, and...
Porosity Storage Reservoirs are man-made water storage reservoirs located in shallow alluvial (sand and gravel) deposits. The porosity, or void space,...
of varying sizes as well as organic compounds. In order to understand porosity better a series of equations have not been used to express the quantitative...
field of formation evaluation, porosity is one of the key measurements to quantify oil and gas reserves. Neutron porosity measurement employs a neutron...
Hydrogen gas porosity is an aluminium casting defect in the form of a porosity or void in an aluminium casting caused by a high level of hydrogen gas...
type logs where resistivity logs and porosity logs were recorded in one pass in the borehole. The two types of porosity logs (acoustic logs and nuclear logs)...
mitigating Kirkendall porosity. Controlling annealing temperature is another method of reducing or eliminating porosity. Kirkendall porosity typically occurs...
Pore structure is a common term employed to characterize the porosity, pore size, pore size distribution, and pore morphology (such as pore shape, surface...
aquifer, releasing relatively large amounts of water (up to the drainable porosity of the aquifer material, or the minimum volumetric water content). In isotropic...
nuts, acorns, and most other nuts are useful in composting. Their high porosity makes them also ideal in the production of activated carbon by pyrolysis...
on the fraction f of the volume occupied by voids. This number f is the porosity of the medium; the wetted length is then x = i f = S f t . {\displaystyle...
Stroke 2016. Liebeskind DS, Agbayani E, Woolf GW, et al. Imaging of clot porosity prior to endovascular thrombectomy. Cerebral Large Artery Disease Posters...
porosity and permeability of the rock. The porosity and permeability are directly influenced by the way the sand grains are packed together. Porosity...
which can range from 0 (completely dry) to the value of the materials' porosity at saturation. It can be given on a volumetric or mass (gravimetric) basis...
is a matter of answering two questions: What are the lower limits for porosity, permeability and upper limits for water saturation that permit profitable...
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There are low, medium and high hair porosity. Low hair porosity is when the hair cuticles are tightly shut. Low porosity hair has difficulty obtaining moisture...
off-white to yellow to red color. The density of limestone depends on its porosity, which varies from 0.1% for the densest limestone to 40% for chalk. The...
lower permeability, while in unconventional reservoirs the rocks have high porosity and low permeability, which keeps the hydrocarbons trapped in place, therefore...
composition of the aquifer. The most important properties of the aquifer are porosity and specific yield which in turn give its capacity to release the water...
concrete and porous pavement) is a special type of concrete with a high porosity used for concrete flatwork applications that allows water from precipitation...
sedimentary rock (lithification) is simply accompanied by a reduction in porosity and water expulsion (clay sediments), while their main mineralogical assemblages...
effective porosity and increasing with an increasing effective confining stress. This means that a sonic log can be used to calculate the porosity, confining...
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