Permeability: Difference between revisions
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[[File:640px-Permeable_paver_demonstration.jpg|400px|framed|right|Figure 1. The slab above is a permeable material as it is allowing the water to trickle through the spaces in the material.<ref>JJ Harrison. (May 20, 2015). ''Permeable Pavement'' [Online]. Available: http://en.wikipedia.org/wiki/Permeable_paving#/media/File:Permeable_paver_demonstration.jpg</ref>]] | [[File:640px-Permeable_paver_demonstration.jpg|400px|framed|right|Figure 1. The slab above is a permeable material as it is allowing the water to trickle through the spaces in the material.<ref>JJ Harrison. (May 20, 2015). ''Permeable Pavement'' [Online]. Available: http://en.wikipedia.org/wiki/Permeable_paving#/media/File:Permeable_paver_demonstration.jpg</ref>]] | ||
<onlyinclude>'''Permeability''' refers to the degree to which pore spaces | <onlyinclude>'''Permeability''' refers to the degree to which pore spaces (voids that can be filled by a fluid) in a medium connect to each other, promoting the movement of [[fluid]] through that material.</onlyinclude> Permeability and [[porosity]] (the number of void spaces in a medium) are closely connected, however, a material may be highly porous but have few channels connecting these pores, leading to a low permeability. In a permeable material, holes, pores, and cracks are lined so that fluid is able to flow through the material.<ref name="geo">Stephen Marshak. (May 20, 2015). ''Earth: Portrait of a Planet'', 3rd ed. New York, NY, U.S.A:W.W. Norton & Company, 2008</ref> The permeability of a material is determined by assessing how much a material resists the flow of fluids—if it takes a lot of [[pressure]] to squeeze fluid through the material it has low permeability. Conversely, if the fluid travels through easily it has high permeability.<ref name="RE1">Geomore: Introduction to Petroleum Geology. (May 20, 2015). ''Porosity and Permeability'' [Online]. Available: http://www.geomore.com/porosity-and-permeability-2/</ref> | ||
==Relation to Fossil Fuels== | ==Relation to Fossil Fuels== | ||
The porosity and permeability of rocks is important in determining | The porosity and permeability of rocks is important in determining which rocks will make a good [[oil and gas reservoir|reservoir]]. A rock that is both porous and permeable would make a good reservoir rock as it allows [[oil]] and [[natural gas|gas]] to move up through the pores in the rock closer to the surface where it can be extracted. The greater the permeability, the easier it is to extract oil from the rock.<ref name="geo"/> Rocks such as sandstone have a very high porosity and permeability and make a productive oil or [[natural gas well]]. Looking at the permeability of rocks is one way that geologists can determine where a good location for an [[oil well]] is.<ref name="RE1"/> | ||
==Relation to Building== | ==Relation to Building== | ||
Understanding the permeability of different building materials is vital | Understanding the permeability of different building materials is vital to ensure that there is no water or vapour intrusion into the [[building envelope]], which could promote rotting of materials or mould growth. In general, permeability is an important consideration for interior wall finishes. In hot and humid climates the permeability of the interior finish of a wall should be much higher than that of the exterior finish of the same wall. This difference in permeability will allow moisture that enters the wall to migrate to the inside of the building where the moisture will be removed by the [[air conditioner|air conditioning]] system. The reverse is true for cold climates; the exterior finish should have a higher permeability than the interior finish.<ref>CertainTeed. (May 20, 2015). ''Protecting the Building Envelope from Moisture Damage'' [Online]. Available: http://www.certainteed.com/en-US/Insulation/Education-Center/Case-Studies-and-Articles/Case-Study-Detail?id=122&divisionid=6</ref> | ||
==For Further Reading== | |||
*[[Fluid]] | |||
*[[Porosity]] | |||
*[[Oil and gas reservoir]] | |||
*[[Hydraulic fracturing]] | |||
*[[Oil well]] | |||
*Or explore a [[Special:Random|random page]] | |||
==References== | ==References== | ||
{{reflist}} | {{reflist}} | ||
Revision as of 19:48, 19 June 2018
Permeability refers to the degree to which pore spaces (voids that can be filled by a fluid) in a medium connect to each other, promoting the movement of fluid through that material. Permeability and porosity (the number of void spaces in a medium) are closely connected, however, a material may be highly porous but have few channels connecting these pores, leading to a low permeability. In a permeable material, holes, pores, and cracks are lined so that fluid is able to flow through the material.[2] The permeability of a material is determined by assessing how much a material resists the flow of fluids—if it takes a lot of pressure to squeeze fluid through the material it has low permeability. Conversely, if the fluid travels through easily it has high permeability.[3]
Relation to Fossil Fuels
The porosity and permeability of rocks is important in determining which rocks will make a good reservoir. A rock that is both porous and permeable would make a good reservoir rock as it allows oil and gas to move up through the pores in the rock closer to the surface where it can be extracted. The greater the permeability, the easier it is to extract oil from the rock.[2] Rocks such as sandstone have a very high porosity and permeability and make a productive oil or natural gas well. Looking at the permeability of rocks is one way that geologists can determine where a good location for an oil well is.[3]
Relation to Building
Understanding the permeability of different building materials is vital to ensure that there is no water or vapour intrusion into the building envelope, which could promote rotting of materials or mould growth. In general, permeability is an important consideration for interior wall finishes. In hot and humid climates the permeability of the interior finish of a wall should be much higher than that of the exterior finish of the same wall. This difference in permeability will allow moisture that enters the wall to migrate to the inside of the building where the moisture will be removed by the air conditioning system. The reverse is true for cold climates; the exterior finish should have a higher permeability than the interior finish.[4]
For Further Reading
References
- ↑ JJ Harrison. (May 20, 2015). Permeable Pavement [Online]. Available: http://en.wikipedia.org/wiki/Permeable_paving#/media/File:Permeable_paver_demonstration.jpg
- ↑ 2.0 2.1 Stephen Marshak. (May 20, 2015). Earth: Portrait of a Planet, 3rd ed. New York, NY, U.S.A:W.W. Norton & Company, 2008
- ↑ 3.0 3.1 Geomore: Introduction to Petroleum Geology. (May 20, 2015). Porosity and Permeability [Online]. Available: http://www.geomore.com/porosity-and-permeability-2/
- ↑ CertainTeed. (May 20, 2015). Protecting the Building Envelope from Moisture Damage [Online]. Available: http://www.certainteed.com/en-US/Insulation/Education-Center/Case-Studies-and-Articles/Case-Study-Detail?id=122&divisionid=6
