Hi John T: Your answer is that it takes more voltage to jump a gap when the air pressure goes up. OK? Don't ask for formula etc.. It has been about 46 or 47 years ago when I worked in a Research & Development Lab at Collins Radio in Cedar Rapids IA. One job I was on for a few months was to evaluate a new antenna coupler for the then front line F-4 Phantom fighter. I put it in a large pressure chamber and tested it at various pressure settings.. Sea level to 50,000 feet in 5 & 10K steps. Amazing how much RF energy was lost into space with less air pressure. I should have also run it in the dark and taken pictures of electric "sparks" all over the unit. Same concept as your question: Voltage needed with change in air pressure. More air pressure needs more voltage. Use the top fuel quarter mile engine voltage needed as a referance.. Duration(time) of the spark plays a big part too in amount of electrial power needed. I quit Collins after just 6 years since I liked flying more and it payed better.. even though Collins R&D lab was a Great job. ag. ret.
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