| PGPU | Gas permeance (GPU, 7.5 × 10−12 m3 (STP)/m2·s·Pa) |
| V | Volume of the downstream chamber (cm3) |
| A | Effective area of the membranes (cm2) |
| T | Temperature (K) |
| dp | Transmembrane pressure (cmHg) |
| dt | Time (s) |
| αi, j | Ideal selectivity of two gases i and j |
| Ra | Surface roughness (nm) |
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