Gas Flow Conductance

Viscous and Molecular Flow


Viscous Flow: 

Distance between molecules is small; collisions between molecules dominate; flow through momentum transfer; generally P greater than 0.1 mbar

Transition Flow: 

Region between viscous and molecular flow

Molecular Flow: 

Distance between molecules is large; collisions between molecules and wall dominate; flow through random motion; generally P smaller than 10 mbar


Vacuum Pressure Ranges




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