| 释义 |
diffusion hygrometer diffusion hygrometer[də′fyü·zhən hī′gräm·əd·ər] (engineering) A hygrometer based upon the diffusion of water vapor through a porous membrane; essentially, it consists of a closed chamber having porous walls and containing a hygroscopic compound, whose absorption of water vapor causes a pressure drop within the chamber that is measured by a manometer. |