Knudsen gas
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A Knudsen gas is a model for gases where particle collisions are ignored, as opposed to the Lorentz gas where collisions are considered. In these gases the mean free path of molecules is bigger than the receptacle where the gas is contained.
A flow of gas through a pipe is called Knudsen flow when it can be expressed as the difference of two independent flows, which enter the pipe through its different ends.
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