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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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 (dimensionless) is the relative humidity. |
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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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G (SI unit: kg/m3·s) is the moisture source.
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