Abstract
We speak of a vacuum arc when vacuum existed around the electrodes at arc ignition and no gas was admitted during the lifetime of the arc. Evidently, the arc burns in the metal vapor issued from the electrodes. The rate of evaporation is essentially the same as with arcs burning in air. In Fig. (56.09) the material transferred per Coulomb is plotted against current intensity for both arcs in air and arcs in vacuum. The plots arrange themselves along the same curve.
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