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Created page with 'File:lighterstill.jpgright|frame *[http://en.wikipedia.org/wiki/14th_century] ==Definitions== *1a : possessing or full of pores :b : containing ves...'
[[File:lighterstill.jpg]][[File:SHA-POROSITY.jpg|right|frame]]
*[http://en.wikipedia.org/wiki/14th_century]
==Definitions==
*1a : possessing or full of pores
:b : containing vessels <hardwood is porous>
*2a : permeable to [[fluids]]
:b : permeable to outside [[influences]]
*3: capable of being [[penetrated]] <porous national boundaries>
==Description==
'''Porosity''' or ''void fraction'' is a measure of the void (i.e., "empty") spaces in a [[material]], and is a fraction of the [[volume]] of voids over the total volume, between 0–1, or as a percentage between 0–100%. The term is used in multiple fields including pharmaceutics, ceramics, metallurgy, materials, manufacturing, [[earth science]]s, [http://en.wikipedia.org/wiki/Soil_mechanics soil mechanics] and [http://en.wikipedia.org/wiki/Engineering engineering].
In gas-liquid [http://en.wikipedia.org/wiki/Two-phase_flow two-phase flow], the void fraction is defined as the fraction of the flow-[[channel]] volume that is occupied by the gas phase or, alternatively, as the fraction of the cross-sectional area of the channel that is occupied by the gas phase. Void fraction usually varies from location to location in the flow channel (depending on the two-phase [[flow]] pattern). It fluctuates with [[time]] and its [[value]] is usually time averaged. In separated (i.e., non-homogeneous) flow, it is related to volumetric flow rates of the [[gas]] and the [[liquid]] phase, and to the [[ratio]] of the [[velocity]] of the two phases (called ''[http://en.wikipedia.org/wiki/Slip_ratio_(gas-liquid_flow) slip ratio)]''.
Used in geology, hydrogeology, soil science, and building science, the ''porosity'' of a porous [[medium]] (such as rock or sediment) [[describes]] the [[fraction]] of void space in the [[material]], where the void may contain, for example, [[air]] or [[water]]. [http://en.wikipedia.org/wiki/Porous]
[[Category: Earth Science]]
*[http://en.wikipedia.org/wiki/14th_century]
==Definitions==
*1a : possessing or full of pores
:b : containing vessels <hardwood is porous>
*2a : permeable to [[fluids]]
:b : permeable to outside [[influences]]
*3: capable of being [[penetrated]] <porous national boundaries>
==Description==
'''Porosity''' or ''void fraction'' is a measure of the void (i.e., "empty") spaces in a [[material]], and is a fraction of the [[volume]] of voids over the total volume, between 0–1, or as a percentage between 0–100%. The term is used in multiple fields including pharmaceutics, ceramics, metallurgy, materials, manufacturing, [[earth science]]s, [http://en.wikipedia.org/wiki/Soil_mechanics soil mechanics] and [http://en.wikipedia.org/wiki/Engineering engineering].
In gas-liquid [http://en.wikipedia.org/wiki/Two-phase_flow two-phase flow], the void fraction is defined as the fraction of the flow-[[channel]] volume that is occupied by the gas phase or, alternatively, as the fraction of the cross-sectional area of the channel that is occupied by the gas phase. Void fraction usually varies from location to location in the flow channel (depending on the two-phase [[flow]] pattern). It fluctuates with [[time]] and its [[value]] is usually time averaged. In separated (i.e., non-homogeneous) flow, it is related to volumetric flow rates of the [[gas]] and the [[liquid]] phase, and to the [[ratio]] of the [[velocity]] of the two phases (called ''[http://en.wikipedia.org/wiki/Slip_ratio_(gas-liquid_flow) slip ratio)]''.
Used in geology, hydrogeology, soil science, and building science, the ''porosity'' of a porous [[medium]] (such as rock or sediment) [[describes]] the [[fraction]] of void space in the [[material]], where the void may contain, for example, [[air]] or [[water]]. [http://en.wikipedia.org/wiki/Porous]
[[Category: Earth Science]]