How do porosity and permeability differ?
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Porosity:\n\nThe percentage of the total volume of rock or soil that consists of open spaces. (The space between particles is called pore space.) It describes how densely the material is packed .\n\nPermeability:\n\nA measure of a material's ability to transmit liquids.\n\nExample: Upon discovery of a Leaking Underground Storage Tank (LUST) the soil beneath it was tested. The greater the permeability, the more rapidly the liquid could reach an underground stream or aquifer.
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Solid- molecules move slowly, can not be compressed, do not take the shape of their container.\nLiquid- molecules slide past one another, can not be compressed and take the shape of their container.\nGas- molecules move in a rapid, random motion, can take the shape of their container and can be compressed
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some cells to take in more. Cell permiablility.\n\nhttp://www.answers.com/topic/cell-permeability
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granite it not permeable, its impermeable. Unless of course if you dissolve the various minerals using acid to make it permeable.
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permeability and dielectric
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Some diffuse across the membrane.  The membrane is semipermeable  meaning that it allows some things to diffuse accross and some cannot pass at all.  example: Water will diffuse accross.\n\nTheir a various channels in the membrane that will transport items into and out of a cell even against a concentration gradient.\nTheir are calcium and sodium channels.\n\nSome are engulfed by animal cells: example:  white blood cells will engulf bacteria:phagocytossis
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False.\n\nPermeable rocks allow water to move through them. Impermeable rocks don't therefore the water would run off.
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Its all about shape and volume.  Solids have a set, defined shape, and a set volume.  Liquids have no defined shape, but a set volume, and gas has no set shape nor a set volume.  Those two things define whether or not something is solid, liquid, or gas.
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Characteristics are Mass, Volume, Density and viscosity.\nDensity (rho)=mass/volume
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permeability of the cell membrane
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An isobar shows regions of similar air pressure.\n\nAn isotherm shows regions of similar temperature.
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(m)\n\nUsed in geology,building science and hydrogeology, the porosity of a rock or sediment is the proportion of the non-solid volume to the total volume of material, and is defined by the ratio: where Vp is the non-solid volume (pores and liquid) and Vm is the total volume of material, including the solid and non-solid parts. Both and are used to denote porosity.
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To consider this, we have to assume that all matter is made up of molecules. By definition, liquid molecules are very close together such that the space between adjacent molecules is very small. Hence liquids are relatively incompressible. On the other hand, gases are defined such that the molecules are spread very far apart and hence the space between adjacent molecules is very large. This accounts for the compressibility of gases.
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Their difference in polarity and density are probably the two most likely properties to affect the rate of separation. Molecular weight differences between the two liquids would probably have some impact, also temperature would effect the rate of separation.
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Basically the semi-permeable membranes and capillary beds carry out osmosis. Osmosis is the passive diffusion of water molecules from a higher water potential to a lower water potential. Water moves from an area with higher concentration of water to an area with less water until the concentration of water in both areas become equal. Semi-permeable membranes and capillaries have thin walls that allow the passage of water. Thus water can move according to its concentration across the membranes.
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Here you have a free downloable PDF presentation from the 28 Sep 05 Conference Micro & Nano Technology (MNT) Measurement Club. I think it's worth to have a look.\n\n"Measuring Nanoparticle Surface Area and Porosity by Gas Sorption"\nMike Tucker, Quantachrome UK\nThe technique of gas sorption has long been used for the determination of surface area and pore size distribution of particulate systems and porous solids. While traditional sorption systems have proved adequate for the majority of tasks, the latest generation of ultra-fine materials, often coupled with microporosity offer new challenges to the sorption scientist. To meet these challenges many new developments have been made in the fields of analytical instrumentation and software modelling. The presentation will review some of the new techniques available, and provide examples to illustrate their applicability to the field of nanotechnology.\nDownload presentation: http://www.npl.co.uk/php/docs/download.php?area=metrology_clubs&path_name=/metrology_clubs/mnt/meetings/28sep05/presentations/connagh.pdf
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For it to create artesian conditions it would have to be something that has very low, or no, permeability.  In my experience this is usually unfractured limestone, mudstone, or shale.