More specifically, we can say that there is a trend towards equilibrium between the water vapourpressure in the product and the partialpressure of the water vapour in the air.
我们可更准确地说，是产品内部的水蒸汽压力与空气中部分的的水蒸汽压力之间有一种趋于平衡的趋势。
2
After inflexion, the permeation flux is directly proportional to the difference of the square root of the vapourpartialpressure on both sides of the membrane.