$$ \dotm leak = C_d \cdot A gap \cdot \sqrt \frac2R T_up \cdot \frac\kappa\kappa-1 \left[ \left( \fracP_downP_up \right)^\frac2\kappa - \left( \fracP_downP_up \right)^\frac\kappa+1\kappa \right] $$

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