Conductivity of Mixtures of Gases

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Scientific paper

IT is well known that the electrical conductivity of certain gases may be greatly increased by the addition of very small quantities of other gases. For example, the electrical conductivity of pure helium is greatly improved by the addition of 0.01 per cent of pure argon. In gases, the electrical conductivity in uniform fields between parallel plates depends upon the ratio X/p, where X is the electrical intensity in volts per centimetre, and p is the pres sure in millimetres of mercury, and is a maximum for a certain value of X/p depending upon the nature of the gas. The photo-electric currents obtained with a constant force between parallel plates at different distances apart are represented by the ordinates of the curves, Fig. 1, and the potential differences between the plates by the abscissæ. The three curves give the currents in pure helium, in pure argon and in helium containing 0.025 per cent of argon. The values of the ratio X/p were, 50 in pure helium, 200 in pure argon and 15 in the mixture. Under these conditions the rate of increase of the current with the distance between the plates was a maximum.

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