aire des vides en pourcentage

CONT: Les termes qui suivent définissent les caractéristiques de filtration des géotextiles (...) Aire des vides en pourcentage - c'est l'aire totale des vides, divisée par l'aire totale de la toile filtrante multipliée par 100.

CONT: This important fabric property has applicability only for woven fabrics, and even then primarily for monofilament woven fabrics. Percent open area (POA) is a comparison of the total open area (the void spaces between adjacent fibers) to the total specimen area. A convenient way to measure the open area is to project a light through the fabric onto a large poster-sized piece of cardboard.
CONT: The following terms delineate the filtration characteristics of engineering fabrics. ... Percent Opening Area is the summation of the open areas divided by the total area of the filter fabric.