| 词汇 | porosity |
| 释义 | porosity noun[ U ] uk /pɔːˈrɒs.ə.ti/ us /pɔːrˈɑː.sə.t̬i/ the state of being porous渗透（性）;多孔（性） Holes, hollows and dips anti-crack aperture blistered chink cranny cratering gauge gouge hollow interstice leak leaky micropore microporosity microporous piercing pinprick shaft thumbhole void Examples of porosityporosity We shall assume that the porosity is the same in the two media. The arrangement of particles has given the samples high porosity, the pores are wide and fluids are therefore free to move, making the samples permeable. This large effective porosity allows the ingress of water within the grains, with potential damage to the grain upon freezing and thawing. The difference between scenarios (c) and (d) will be related to the porosity of the regolith. He saw no major difficulties in postulating peripheral porosities for the blood to circulate, although he could not visualize them for the time being. However, there are many factors that would affect the thermal conductivity, including the rock type, its mineral composition and porosity. It is clear from these results that porosity is not the sole criterion for rock colonization by micro-organisms. As well as the mineralogy of the sample, the textures (grain size, shape, porosity) were determined. It also looks at erosional processes, and very briefly at carbonate rock description and porosity. Compaction increased soil bulk density and penetration resistance and decreased porosity and per meability. The present day petrography of this formation shows a medium-grained and well-sorted quartzite with syntaxial quartz cements and virtually zero porosity. Secondary porosity development (alarmingly called decompaction!) is thought to result from carbonate solution by carbonic acid formed by decarboxylation during early stage hydrocarbon generation. The porosity values of the ceramics and soil were estimated to be 15% and 30%, respectively. Under low stresses, grain fracturing may be absent and deformation is accommodated also by grain rotation, grain sliding and porosity reduction. Along with a measure of humidity, this is related to the porosity of the medium. These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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