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Porosity is a fraction between 0 and 1, typically ranging from less than 0.005 for solid granite to more than 0.5 for peat and clay. The porosity of a rock, or sedimentary layer, is an important consideration when attempting to evaluate the potential volume of water or hydrocarbons it may contain.
In English, lexical prosody is used for a few different reasons. As we have seen above, lexical prosody was used to change the form of a word from a noun to a verb. Another function of lexical prosody has to do with the grammatical role that a word plays within a sentence.
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.
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Comparing this distance to the straight-line distance shows that the tortuosity is about 1.5 for this sample. It has been demonstrated that the tortuosity increases when the porosity decreases. [10] Usually subjective estimation is used. However, several ways to adapt methods estimating tortuosity in 2-D have also been tried.
The English spoken in the West Indies, [103] in Africa [104] and in India [105] are probably better characterized as syllable-timed, though the lack of an agreed scientific test for categorizing an accent or language as stress-timed or syllable-timed may lead one to doubt the value of such a characterization.
However, there is also a concept of closed porosity and effective porosity, i.e. the pore space accessible to flow. Many natural substances such as rocks and soil (e.g. aquifers, petroleum reservoirs), zeolites, biological tissues (e.g. bones, wood, cork), and man made materials such as cements and ceramics can be considered as porous media ...
Porosity that is not considered "effective porosity" includes water bound to clay particles (known as bound water) and isolated "vuggy" porosity (vugs not connected to other pores, or dead-end pores). The effective porosity is of great importance in considering the suitability of rocks or sediments as oil or gas reservoirs, or as aquifers.