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 It might be outdated or ideologically biased.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 holes are formed in the rock mass after pyrolysis, and the porosity of oil shale increases further.
When the effects of permeable cylinders are examined, it is observed that the reverse flow does not form in the fields of view for all porosity values and the minimum value of streamwise velocity component increases and the location of the minimum value of streamwise velocity moves further downstream of the permeable cylinder with increasing the porosity.
The sonic log is a porosity log that measures interval transit time (Asquith and Gibson, 1982).
Figure 1 shows a plan view schematic of the passive porosity concept applied to a generic bluff-body configuration.
In view of these observations, it is necessary to develop a model for compressive strength prediction of high-porosity cast-in-situ foamed concrete that should consider the porosity and the degree of hydration.
Because of this, this research attempts to provide an approximate theoretical basis for the measured variation of ultrasound velocity with porosity of dry and saturated cement paste using the finite element method (FEM).
Therefore, tests of different water pressures but the same porosity (0.36) were carried out to study the critical water pressure for water inrush, and the designed water pressures were increased from 0.2 MPa to critical value by every 0.2 MPa.
Typically, separators with high porosity and less thickness are required.
As mention in the introduction, the variation of water to plaster ratio play an importance role in determining the performance of the mould in terms of water absorption, porosity, and strength.
SCANCO [mu]CT software was used to analyze the images and the porosity of scaffolds was calculated as follows:
High and low porosity substrates with a designed three-way technology were evaluated in the close-coupled position at different PGM loadings.
Sundial has introduced two new hair care collections addressing porosity in recognition of the fact that it is a crucial factor in achieving healthy, manageable hair.