Porosity

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porosity

[pə′räs·əd·ē]
(physics)
Property of a solid which contains many minute channels or open spaces.
The fraction as a percent of the total volume occupied by these channels or spaces; for example, in petroleum engineering the ratio (expressed in percent) of the void space in a rock to the bulk volume of that rock.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Porosity

 

in geology, the aggregate of pores, joints, channels, and other cavities in a rock massif, regardless of their shape and dimensions. The porosity and jointing of rock and other such concepts are distinguished.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

porosity

A ratio, usually expressed as a percentage, of the volume of voids in a material to the total volume of the material, including the voids. The voids permit gases or liquids to pass through the material.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in periodicals archive ?
The time-averaged streamline topologies for various porosities at the cylinder diameters of D=37.5 mm are illustrated in Fig.
Seepage Properties under Different Initial Porosities. As displayed in Figure 11, water inflow decreases with the decrease of initial porosity, for example, water inflow for [phi] = 036 is 395.84 ml/min, and the evolution curve is nonlinear, while when [phi] [less than or equal to] 0.3, the evolution curve is kept stable and almost unchanged; the finial water inflow is less than 100 ml/min, an over 60% decrease of that in [phi] = 036, indicating that the water inflow decreases rapidly when the initial porosity decreases to 0.3, especially it decreases 30% to 0.23.
Porosities ranging from 10% to 60%, as aforementioned, are introduced into the models in the form of uniformly spaced spherical pores conforming to the square array pore distribution pattern, as has been illustrated in Figure 1.
Table 14 shows the final measured porosities for all of the methods used in this paper.
Therefore, the modified Razack equation was the easiest to manipulate to reproduce a suitable range of porosities from the initial values.
Accessible porosities for HTO (for all clay densities) and [Cl.sup.-] (for clay densities up to 1.2 g/[cm.sup.3]) were directly obtained by means of saturation experiments.
In addition, this research studied the dynamic characteristics of weakly weathered granites with different porosities in a rare-earth deposit in Anyuan County [1], Jiangxi Province, China.
The TOF is reduced in the high permeability zone when the effective porosities of the heterogeneous domain and ambient reservoir are equal.
The porosity predicted through probabilistic neural network shows a fair amount of correlation with the porosities estimated from well logs (Russell, 2013), as shown in figures 7 and 8.
In this paper, the uniaxial compression of the cylinder model with different porosities was carried out in the same loading rate and time step, and the plastic zone of the failure process of each model was obtained (Figure 10).
The focus of this paper is to show how a reliable relationship between specific capacity and effective porosity was determined, calibrated, and tested, making calculation of effective porosities relatively simple.
Noticeable is the absolute difference between effective and total porosities (Sigurdsson & Stefansson 1994).