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explanation of sparks into air needed



Original poster: "Jim Lux" <jimlux-at-earthlink-dot-net> 

I'm looking for a good short explanation of how sparks can go into air from
a charged object. The problem I'm having is trying to explain that not all
sparks have to go from one place to another place, partly because my
audience has a hard time conceptualizing the idea of a high field that can
cause a breakdown.