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Vacuum Conductance Molecular Flow Calculator engineering
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Vacuum Conductance Molecular Flow Calculator

High-vacuum systems engineering: Calculate molecular flow conductance ($C$) through cylindrical pipes, Clausing transmission probabilities ($\alpha_c$), aperture conductance, and effective pumping speed.

Vacuum Duct Geometry

Standard ISO-K / CF flanges
L = 0 for pure orifice aperture

Pumping Speed at Duct Exit

Turbomolecular or diffusion pump rating

Conductance & Effective Pumping Output

Tube Conductance C:
--
Liters / second (L/s)
Effective Pumping Speed S_eff:
--
L/s at chamber port
Clausing Factor:
--
transmission prob α_c
Aperture C_ap:
--
L/s (orifice limit)
Pumping Speed Loss:
--
% lost to piping

Gas Kinetic Velocities & Ratios

Mean Thermal Molecular Velocity $\bar{v}$: --
Tube Aspect Ratio $L / d$: --

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