DeVries type Vapour diffusion.
The model was presented in [12].
The vapour diffusion can be described by
D_v=5.9\cdot 10^{-6} \frac{\left(T\, \text{in K}\right)^{2.3}}{p, \text{in Pa}} D_{vr},
where D_{vr} is the the relative diffusion coefficient, and T is the temperature.
No additional info.
Used in no end-to-end test cases.