Electric arc in 0 gravity? Curved or straight?

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The shape of arcs may be influenced by the relative alignment of the faces of the two electrodes .

Electrode faces which are both angled up do seem to produce upward curved arcs .

220px-Lichtbogen_3000_Volt.jpg
 
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Nidum said:
The shape of arcs may be influenced by the relative alignment of the faces of the two electrodes .
Did You see arc curving down? The heated air in the plasma rises up and the least resistance between electrodes remains through the plasma arc.
 
kevin_tee said:
Yeah big one, but why?
Very long arc is shaped at air movement and the least resistance between electrodes remains through the plasma arc.