WOW, Very interesting, its getting where I can half way understand it now. Its one of those things I learned somewhere maybe years ago but had no idea how to explain it (the pure physics of it). The air molecules and ionization discussion makes sense.
What surprised me was the vacuum part....
"The best dielectric (harder to strike an arc) is the vacuum, then it gets easier to strike the arc (poor dielectric) with a near-vacuum/some air present/about 0PSI, then as pressure increased to atmospheric (14.7PSI) it becomes a better dielectric (more difficult to arc), and this situation continues along the "more difficult" trend as pressure further increases to say a cylinder pressure of 150PSI."
I thought as pressure increased it was harder to arc so the converse was at less pressure it was easier, but you point out the differences at vacuum versus atmosphere etc.
THANKS TO EVERYONE HERE, it was fun learning experience, but very technical and likely boring to many.
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Today's Featured Article - Memories of an IH Super A When I was ? up to 10, I worked on my Papaw's farm in Greeneville, TN every summer. As I grew older (7), it was the thrill of my day to ride or drive on the tractor. My Papaw had a 1954 IH Super A that he bought to replace a Cub. My Papaw raised "baccer" (tobacco) and corn with the Super A, but the fondest memory was of the sawmill. He owned a small sawmill for sawing "baccer" sticks. The Super A was the powerplant. When I was old enough (7 or 8), I would get up early and be dressed to
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