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TeachMeFinance.com - explain Porosity Porosity The term 'Porosity' as it applies to the area of reclamation can be defined as ' The ratio of the volume of void space to the total volume of an undisturbed sample. A measure of the ratio of open space within a rock or soil to its total volume. A nondimensional value that expresses the ratio of the volume of pores to the total volume of a porous material and is usually expressed as a percentage. Porosity ranges from less than 1 percent to as much as 80 percent in some recently deposited clays, but in most granular materials it falls between about 5 and 40 percent. In free aquifers the porosity is equal to the specific retention plus the specific yield. The capacity of soil or rock to hold water'. The term 'Porosity' as it applies to the area of water can be defined as 'a measure of the water-bearing capacity of subsurface rock. With respect to water movement, it is not just the total magnitude of porosity that is important, but the size of the voids and the extent to which they are interconnected, as the pores in a formation may be open, or interconnected, or closed and isolated. For example, clay may have a very high porosity with respect to potential water content, but it constitutes a poor medium as an aquifer because the pores are usually so small'. The term 'Porosity' as it applies to the area of the weather can be defined as ' In hydrologic terms, (1) The ratio of pore volume to total volume of the formation. Sandy soils have large pores and a higher porosity than clays and other fine-grained soils. (2) An index of the void characteristics of a soil or stream as pertaining to percolation; degree of previousness'. Previous 5 Terms: poriferous poriform Pork bellies porometer poroscope Next 5 Terms: porphyrous porraceous port Portable electric heater Portable fan About the author Mark McCracken Author: Mark McCracken is a corporate trainer and author living in Higashi Osaka, Japan. He is the author of thousands of online articles as well as the Business English textbook, "25 Business Skills in English". Copyright © 2005-2011 by Mark McCracken, All Rights Reserved. TeachMeFinance.com is an informational website, and should not be used as a substitute for professional medical, legal or financial advice. Information presented at TeachMeFinance.com is provided on an "AS-IS" basis. Please read the disclaimer for details.