Addyman, Frank Thornton · London : Scott, Greenwood & co. · leaf 36
dto consist of a great number of molecules moving with greatvelocity, x but the number of molecules, even in a very smallspace, is so enormous that none has to travel very far beforecolliding with another. The average distance which a mole-cule travels under a given pressure is spoken of as the… … Fig. 3.—Crookes Tube. we continue pumping long enough we shall eventually leaveso few that the mean free path will be as large as the lengthof the vessel. In this case the molecules will travel from endto end with no other collisions than their encounters with thewall of the vessel. When a gas has…
X-rays
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