in a vacuum, it will arc at lower voltage. In the military, we have to put a special rtv over the high voltage leads on the aircraft radar systems. As they would NOt arc on the ground, but would arc as the aircraft went higher. My understanding is.....
that the air itself acts as a higher resistance to current flow but as it thins, this resistance barrier of molecues is reduced, so that the same voltage will now start arcing to nearby objects.
And yes, I have 3 or 4 spark plug testers in my garage I have have bought over the years. ALL plugs will FAIL if your turn the pressure up high enough. So that would indicate the air molecules have a higher resistance, the denser that they are packed. I have old honda motorcycles from the 60s that are very finicky on sparkplugs. So I clean and then test them. I also clean and test my mower and tractor plugs. You will be very surprised at how many plugs fail out of the box. On american brand plugs, it one in four that dont pass the required pressure test. I end up putting one of the used plugs back in the tractor is its actually better than a new one in many cases. Japanese plugs seem to always pass to the required pressure level. So for an engine running high/higher compression, the plug brand can be pretty critical. And yes, the bad plugs are not making it to 120 lbs in most cases, so that means they fial in a lot of medium compression engines as well.
Another question to ponder... When they fail, its because you no longer see an arc through the little glass window. Could it still be passing electricity, but since there is no air you can no longer see it???? Or there is no longer heat as the oxygen is removed? Curious minds want to know?? As the radar continues to work perfectly when you see NO arc, I'm assuming there is NO longer transfer of electricity....
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Today's Featured Article - A Cautionary Tale - by Ian Minshull. In the early 1950s my father bought an Allis Chalmers B and I used it for all the row crop work with the mangolds and potatoes, rolling and the haymaking on our farm. The farm and the Allis were sold and I have spent a lifetime working on farms throughout the country. I promised myself that one day I would own an Allis. That time event
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