Definitions for "Electric arc"
a constant strong electric discharge in the air
a high intensity electrical discharge between two electrodes in the presence of low pressure gases or open air. The phenomenon was discovered and demonstrated by British chemist Sir Humphry Davy in 1800.
a discharge of electricity between two electrodes; in effect a continuous electric spark.
Keywords:  welder, pretty, tell, hot, thing
a pretty hot thing- as any welder will tell you
The passage of substantial electric current through ionized air.
area where the current between electrode and base material flows
Keywords:  conduction, gas, field, applied
electrical conduction through a gas in an applied electric field