Yep thats how I always understood it although I cant explain the physics of why. It seems somehow with more molecules packed in there in the space (higher PSI denser air) between the plugs electrode and ground strap theres more resistance to the striking of the arc across the crowed space, but if pressure decreases and especially if it were in a vacuum, it takes less voltage potential before the arc will occur.
The arc is ionizing the air molecules right??? Im still not sure how or why but Im confident it takes more voltage across the gap to arc current as the pressure increases.
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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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