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  2. Porosimetry - Wikipedia

    en.wikipedia.org/wiki/Porosimetry

    Porosimetry is an analytical technique used to determine various quantifiable aspects of a material's porous structure, such as pore diameter, total pore volume, surface area, and bulk and absolute densities. The technique involves the intrusion of a non-wetting liquid (often mercury) at high pressure into a material through the use of a ...

  3. Gas porosity - Wikipedia

    en.wikipedia.org/wiki/Gas_porosity

    Gas porosity is the fraction of a rock or sediment filled with a gas.. Determining the true porosity of a gas filled formation has always been a problem in the oil industry. . While natural gas is a hydrocarbon, similar to oil, the physical properties of the fluids are very different, making it very hard to correctly quantify the total amount of gas in a formati

  4. Capillary flow porometry - Wikipedia

    en.wikipedia.org/wiki/Capillary_flow_porometry

    Capillary flow porometry, also known as porometry, is a characterization technique based on the displacement of a wetting liquid from the sample pores by applying a gas at increasing pressure. It is widely used to measure minimum, maximum (or first bubble point) and mean flow pore sizes, and pore size distribution in membranes [ 1 ] nonwovens ...

  5. Pore structure - Wikipedia

    en.wikipedia.org/wiki/Pore_structure

    Mercury intrusion porosimetry [13] and gas adsorption [14] are common techniques for determining the pore size distribution of materials and power sources. When studying the pore size distribution using the gas adsorption technique utilizing the nitrogen or argon adsorption isotherm at their boiling temperatures, it is possible to determine the ...

  6. Porosity - Wikipedia

    en.wikipedia.org/wiki/Porosity

    Mercury intrusion porosimetry (several non-mercury intrusion techniques have been developed due to toxicological concerns, and the fact that mercury tends to form amalgams with several metals and alloys). Gas expansion method. [6] A sample of known bulk volume is enclosed in a container of known volume.

  7. BET theory - Wikipedia

    en.wikipedia.org/wiki/BET_theory

    BET theory applies to systems of multilayer adsorption that usually utilizes a probing gas (called the adsorbate) that does not react chemically with the adsorptive (the material upon which the gas attaches to) to quantify specific surface area. Nitrogen is the most commonly employed gaseous adsorbate for probing surface(s).

  8. Thermoporometry and cryoporometry - Wikipedia

    en.wikipedia.org/wiki/Thermoporometry_and...

    The technique is closely related to that of use of gas adsorption to measure pore sizes but uses the Gibbs–Thomson equation rather than the Kelvin equation. They are both particular cases of the Gibbs Equations ( Josiah Willard Gibbs ): the Kelvin equation is the constant temperature case, and the Gibbs–Thomson equation is the constant ...

  9. Gas in scattering media absorption spectroscopy - Wikipedia

    en.wikipedia.org/wiki/Gas_in_scattering_media...

    Free gases exhibit very sharp spectral features, and different gas species have their own unique spectral fingerprints. At atmospheric pressure, absorption linewidths are typically on the order of 0.1 cm −1 (i.e. ~3 GHz in optical frequency or 0.006 nm in wavelength), while solid media have dull spectral behavior with absorption features thousand times wider.