One of the main methods to test the gas permeability is using partial pressure difference.
用压差法测试塑料薄膜的透气性，是一个长期使用的主流测试方法。
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。
Oxygen Permeance (PO2) : the ratio of the O2GTR to the difference between the partial pressure of O2 on the two sides of the film.
译文：氧气透过量(PO2)：氧气透过率与薄膜两侧的氧气分压差的比值。
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