what is the difference between porous and permeable?
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Porosity is a measure of how much of a rock is open space. This space can be between grains or within cracks or cavities of the rock. Permeability is a measure of the ease with which a fluid (water in this case) can move through a porous rock.
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The cell membrane is semipermeable (or selectively permeable). It is made of a phospholipid bilayer, along with other various lipids, proteins, and carbohydrates. ... The unique structure of the cell membrane allows small substances (like oxygen or carbon dioxide) to easily pass through.
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Osmosis is the special case of diffusion involving water molecules. ... A selectively permeable membrane allows small, soluble molecules to pass through it, but prevents large insoluble molecules from passing through.
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In biology, this is a difference between the two processes. One big difference between osmosis and diffusion is that both solvent and solute particles are free to move in diffusion, but in osmosis, only the solvent molecules (water molecules) cross the membrane.
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Permeable membranes are those which let solvents and solutes, such as ions and molecules, to pass through them. There are also selectively permeable membranes, which are membranes that, in addition to allowing the passage of solvents, let specific solutes pass through while blocking others.
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Note that a semipermeable membrane is not the same as a selectively permeable membrane. Semipermeable membrane describes a membrane that allows some particles to pass through (by size), whereas the selectively permeable membrane "chooses" what passes through (size is not a factor).
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As nouns the difference between filling and filing is that filling is anything that is used to fill something while filing is any particle that has been removed by a file or similar implement; a shaving.
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Porosity varies depending on particle size and aggregation. It is greater in clayey and organic soils than in sandy soils. A large number of small particles in a volume of soil produces a large number of soil pores. Fewer large particles can occupy the same volume of soil so there are fewer pores and less porosity.
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The cell membrane is selectively permeable, allowing only a limited number of materials to diffuse through its lipid bilayer. All materials that cross the membrane do so using passive (non energy-requiring) or active (energy-requiring) transport processes.
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Material with angular-shaped edges has more open space and can hold more water. ... The unsaturated zone, immediately below the land surface, contains water and air in the open spaces, or pores. The saturated zone, a zone in which all the pores and rock fractures are filled with water, underlies the unsaturated zone.
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Karst aquifers are different from sedimentary aquifers, where water flows mostly through the gravel and sand grains similar to a sponge. ... Porosity represents the volume of water a rock formation can potentially hold. Permeability is how well a fluid can flow within the pore spaces of the rock within the aquifer.
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Infiltration and percolation are two related but different processes describing the movement of moisture through soil. Infiltration is defined as the downward entry of water into the soil or rock surface (SSSA, 1975) and percolation is the flow of water through soil and porous or fractured rock.
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Some people will refer to wicking fabrics as being breathable – that is, they let air in and sweat out. Breathable showerproof and waterproof fabrics have tiny pores in the fabric, larger than water vapour molecules (so these can get out) but much smaller than drops of rain (so these can't get in).
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Impermeable and Breathable Pliolite resin creates a microporous film, which has tiny pores. The pores in the film of our coatings are much smaller than the pores of a masonry substrate, meaning that the wind-driven rain is blocked.
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The main difference between the two is that diffusion can occur in any mixture, even when two solutions aren't separated by a semipermeable membrane, whereas osmosis exclusively occurs across a semipermeable membrane. There are actually three types of passive transport processes.
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Is closed cell foam waterproof? ... Closed cell foam is more impermeable to water, vapor, and air. Therefore, it is less likely to be structurally impacted by the effects associated with water damage: mold, mildew, rot, and bacteria.
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The powder becomes activated when oxidized under extreme heat. Activated charcoal is very porous and highly adsorbent. It also has a wide surface area. Unlike absorbent substances, activated charcoal's adsorbent nature allows it to bind to toxins and odors, rather than soaking (absorbing) them up.