A self-sustaining electrical discharge between at least two electrodes, characterized by a comparatively small cathode
fall voltage, a low burning voltage and a relatively high current density
. The burning voltage of an arc is the voltage across the electrode gap during an arc discharge.
IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997). XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8. doi:10.1351/goldbook