Assessment of the water vapor permeability: Effect of the total pressure

This paper shows that the theory describing gas diffusion with no consideration of total pressure leads to an underestimation water vapor diffusive permeability. experimental method, called cup can be considered as one most popular tests in domain heat and mass transfer for building applications. Thus, it is likely permeability defined current materials underestimated. Thanks approach proposed this paper, provided there advective permeability, possible know whether a given has been underestimated or not. However, not estimate magnitude measurement error. In last part, new procedure proposed, integrating on both sides sample. modified test method makes simultaneously determine coefficient.