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Official air breakdown voltage?



Original poster: "JT Bowles" <jasotb@xxxxxxxxxxx>


I have read all over the net, around 25KV/inch  <<I use this one
I read on one place,           around 30KV/inch
Now i have just been told around 30KV / cm !!!! Thats 3 times the voltage I have been told

It is common sense that air pressure, humididty, current, and time of day all affect air breakdown voltage, but:

IS there any official way to determine exactly what air breakdown voltage is? ( such as KV/distance )