Definitions for ultra-gaseous matter The Standard Electrical
Dictionary Gas so rarefied that its molecules do not collide or
very rarely do so. Experiments of very striking nature have been
devised by Crookes and others to illustrate the peculiar
phenomena that this matter presents. The general lines of this
work are similar to the methods used in Geissler tube
experiments, except that the vacua used are very much higher.
When the vacuum is increased so that but one-millionth of the
original gas is left the radiant state is reached. The molecules
in their kinetic movements beat back and forth in straight lines
without colliding, or with very rare collisions. Their motions
can be guided and rendered visible by electrification. A tube or
small glass bulb with platinum electrodes sealed in it, is
exhausted to the requisite degree and is hermetically sealed by
melting the glass. The electrodes are connected to the terminals
of an induction coil or other source of high tension
electrification. The molecules which