Poreomvang

Poreomvang, or pore volume in English, is the total volume of voids or pores contained within a porous material. It represents the amount of space that can be filled by a fluid and is typically expressed as a volume per volume (cm3/cm3) or per mass (cm3/g). In practice, poreomvang is closely related to porosity but is a distinct quantity: porosity is a dimensionless fraction, while poreomvang provides an absolute pore volume.

The relationship to porosity is given by Vp = porosity × Vt, where Vp is the pore volume and Vt is the total volume of the material. Poreomvang can refer to the total pore volume or to the portion of pores accessible to a particular fluid or probe. Accessibility depends on pore size, connectivity, and the chemical nature of the pore walls.

Measurement and characterization of poreomvang employ several techniques. Mercury intrusion porosimetry (MIP) estimates total pore volume and pore size distribution by forcing mercury into pores under pressure. Gas adsorption methods (such as nitrogen or argon adsorption) determine pore volume for micro- and mesopores and the specific surface area. Imaging techniques, including computed tomography, can visualize pore networks in three dimensions. Skeletal volume methods (e.g., helium pycnometry) help separate solid volume from pore space when combined with other data.

Applications span soils, ceramics, catalysts, construction materials, and energy storage. Poreomvang influences permeability, fluid storage and transport, chemical reactivity, and overall material performance.