译文：气体透过系数（P）：单位时间内单位压力差下稳定透过单位面积上单位厚度的试样的气体体积。
Permeance (P): The ratio of the gas transmission rate to the difference in partial pressure of the gas on the two sides of the film.
译文：气体透过系数（P）：单位时间内单位压力差下稳定透过单位面积上单位厚度的试样的气体体积。
Permeance (P): The ratio of the gas transmission rate to the difference in partial pressure of the gas on the two sides of the film.
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