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. Author manuscript; available in PMC: 2013 Jun 12.
Published in final edited form as: Spectroscopy (Springf). 2009 Feb;24(2):50.

Table 1.

Viscous flow occurs through a capillary used to introduce gas at atmospheric pressure into a high vacuum system. Under these conditions, the conductance of the capillary is proportional D4/L, where D is the tube diameter and L its length.

I.D. (μm) Length (m)
75 21.9
50 4.3
30 0.56
20 0.11