| A (m2) | Membrane area;. |
| D (m2/min) | Diffusivity |
| J (mg·cm−2·min−1) | Flux |
| l (µm) | Thickness |
| p (Pa) | Pressure |
| P (mg·cm·cm−2·min−1·kPa−1) | Permeability |
| R (J mol−1 K−1) | Universal gas constant |
| T (K or °C) | Temperature |
| x | Molar fraction |
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