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  2. Permeability (porous media) - Wikipedia

    en.wikipedia.org/wiki/Permeability_(porous_media)

    A practical unit for permeability is the darcy (d), or more commonly the millidarcy (md) (1 d ≈ 10 −12 m 2). The name honors the French Engineer Henry Darcy who first described the flow of water through sand filters for potable water supply. Permeability values for most materials commonly range typically from a fraction to several thousand ...

  3. Moisture vapor transmission rate - Wikipedia

    en.wikipedia.org/wiki/Moisture_vapor...

    The most common international unit for the MVTR is g/m 2 /day, or "metric perm". In the USA, g/100in 2 /day is also in use, which is 0.064516 (approximately 1/15) of the value of g/m 2 /day units. Typical rates in aluminium foil laminates may be as low as 0.001 g/m 2 /day, whereas the rate in fabrics can measure up to several thousand g/m 2 /day.

  4. Permeability of soils - Wikipedia

    en.wikipedia.org/wiki/Permeability_of_soils

    It causes an obstruction to the flow of water in the pores and hence reduces the permeability of soils. According to Casagrande, it may be taken as the void ratio occupied by absorbed water and the permeability may be roughly assumed to be proportional to the square of the net voids ratio of (e - 0.1) [4]

  5. Permeation - Wikipedia

    en.wikipedia.org/wiki/Permeation

    This method involves taking a sample of the test chemical and placing it on the surface of the material whose permeability is being observed while adding or removing specific amounts of the test chemical. After a known amount of time, the material is analyzed to find the concentration of the test chemical present throughout its structure.

  6. Permeability - Wikipedia

    en.wikipedia.org/wiki/Permeability

    Permeability (earth sciences), a measure of the ability of a material (such as rocks) to transmit fluids Relative permeability, in multiphase flow in porous media; Permeability (foundry sand), a test of the venting characteristics of a rammed foundry sand; Hydraulic conductivity, the permeability of soil for water

  7. Hydraulic conductivity - Wikipedia

    en.wikipedia.org/wiki/Hydraulic_conductivity

    Laboratory tests using soil samples subjected to hydraulic experiments; Field tests (on site, in situ) that are differentiated into: small-scale field tests, using observations of the water level in cavities in the soil; large-scale field tests, like pumping tests in wells or by observing the functioning of existing horizontal drainage systems.

  8. Cone penetration test - Wikipedia

    en.wikipedia.org/wiki/Cone_penetration_test

    The test method consists of pushing an instrumented cone, with the tip facing down, into the ground at a controlled rate (controlled between 1.5 -2.5 cm/s accepted). The resolution of the CPT in delineating stratigraphic layers is related to the size of the cone tip, with typical cone tips having a cross-sectional area of either 10 or 15 cm 2 ...

  9. Porosity - Wikipedia

    en.wikipedia.org/wiki/Porosity

    Imbibition methods, [6] i.e., immersion of the porous sample, under vacuum, in a fluid that preferentially wets the pores. Water saturation method (pore volume = total volume of water − volume of water left after soaking). Water evaporation method (pore volume = (weight of saturated sample − weight of dried sample)/density of water)

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