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Free burning arcs at atmospheric pressure in sulphur hexafluoride (SF 6 ) have been found to be extremely unstable. For potential gradient measurements to be carried out the requirements for wall-stabilization of the areas have been examined and compared with those for nitrogen. The characteristics for arcs in SF 6 and N 2 have been measured for currents up to 50 A by two different methods and these results have been used to determine the mean electrical conductivity as a function of are current
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Gozna et al. (1967) studied this question.
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