c	water concentration in kg/m3	T	absolute temperature in K
D	diffusion coefficient in cm2/s	D app	apparent diffusion coefficient in cm2/s
t	diffusion time in s	S	solubility coefficient in g/g
l	polymer thickness in cm	S 0	constant
φ	water mass fraction in %	ΔωH	enthalpy of sorption in kJ/mol
M t	water mass at time t in mg	P	permeability coefficient in cm2/s
M ∞	water mass in saturation in mg	P 0	constant
ε r	wet film permittivity	E p	activation energy for permeability in kJ/mol
ε c	dry film permittivity	(DEB)D	Deborah number
ε w	water permittivity	θ D	characteristic time of penetrant diffusion in s
ε a	air permittivity	λ m	characteristic time of polymer relaxation in s
ε 0	vacuum permittivity in F/m	k	constant
V	wet film volume in cm3	R c	polymer resistance at time t in Ω·cm2
V c	dry film volume in cm3	τ	time constant in s
V w	water volume in cm3	SC	swelling coefficient in g/s
V a	air volume in cm3	M c	mass of dry polymers in mg
ΔV	swelling volume of polymers in cm3	α	volume fraction of dry polymers in %
C c	polymer capacitance at time t in F/cm	β	volume fraction of water/air in %
C 0	dry polymer capacitance in F/cm	CPE	constant phase angle element
C ∞	polymer capacitance in saturation in F/cm	C HF	capacitance at highest frequency in F/cm
A	polymer superficial area in cm2	C effect	effective capacitance in F/cm
X V	water volume fraction in %	C dl	capacitance of electrical double layer in F/cm
ρ w	water density in g/cm3	E a	activation energy in kJ/mol
T g	glass transition temperature in °C	D 0	diffusion coefficient at infinity time in cm2/s
R	Gas constant, 8.314 J/(mol·K)