vahemik, mille ulatuses pooride mõõtmetel poorses materjalis on lubatav varieeruda (vt poor, poori mõõde, pooride mõõtmejaotus), the limits between which a variation in pore size is allowed (see: pore, pore size, pore size distribution), допустимый диапазон изменений размера поры (см. пора)