The definition of a free molecular flow depends on the distance scale under consideration.
2.
In free molecular flow, the pressure of the remaining gas can be considered as effectively zero.
3.
Because turbomolecular pumps only work in molecular flow conditions, a pure turbomolecular pump will require a very large backing pump to work effectively.
4.
In fluid dynamics, the "'Knudsen equation "'is used to describe how gas flows through a tube in free molecular flow.
5.
For example, in the interplanetary medium, the plasma is in a free molecular flow regime in scales less than 1 AU; thus, planets and moons are effectively under particle bombardment.
6.
Molecular distillation is vacuum distillation below the pressure of 0.01 torr . 0.01 torr is one order of magnitude above high vacuum, where fluids are in the free molecular flow regime, i . e . the mean free path of molecules is comparable to the size of the equipment.
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