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ξ (SI unit: kg/m3) is the moisture storage capacity.
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δp (SI unit: s) is the vapor permeability.
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psat (SI unit: Pa) is the vapor saturation pressure.
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T (SI unit: K) is the temperature.
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Vapor permeability (default) to define the vapor permeability δp directly. The default is taken From material. For User defined, set a value.
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See Building Materials Database in the COMSOL Multiphysics Reference Manual for a description of materials containing the thermal and hygroscopic properties required by the Building Material node.
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Heat and Moisture Transport in a Semi-Infinite Wall: Application Library path Heat_Transfer_Module/Verification_Examples/semi_infinite_wall
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