Question 6

Modern outdoor textiles are waterproof. At the same time, these materials are supposed to let water vapor pass from the inside to the outside. This increases the comfort: not only do you not get wet from the rain but also does water vapor from transpiration diffuse from the inside to the outside. But can this really work? During a rain event, the relative humidity in the air is close to 100%. Assume that the membrane of your waterproof jacket does indeed have tiny pores through which water vapor molecules can pass to the outside as claimed by the manufacturer? But would there really be a net transport to the outside if there is 100% humidity on both sides of the membrane?

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