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From Ludwik Kowalski
have a related question (about plasma "pushed by a pressure difference").?he Ar atoms?
uppose a mixture of two gases, such as He and Ar in thermal equilibrium,
s inside a long cylindrical tube. A thin alluminum window, at one end of
he tube, breakes and the mixture is ejected into the surrounding vacuum.
ach atom gains a non-random velocity component along the axis. Is the
verage non-random velocity component for the He atoms the same as for