Abstract

Abstract The discharge of electricity through gases is a phenomenon known since the eighteenth century. In a standard type of experiment, a glass tube filled with air, containing positive and negative electrodes, is used. When the pressure of the air in the tube is reduced to a few millimeters of mercury and a source of high potential is connected to the positive electrode, an electrical discharge fills the space between the electrodes with a pink or reddish glow. If the pressure is reduced to about 0.1 millimeters of mercury the appearance of the glow changes, as indicated in Figure 2.

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