Yes, because PV=nRt
From this equation it becomes apparent that air pressure, V, can be negative. Since negative temperatures can exist, such as -30C (remember you have to use Celsius and not Fahrenheit).
Thus we have negative numbers for air pressure.
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yes it does come from the ground lighting is an oxidized column of air, the ground being the negative pole, and the air being the positive pole. Like arching a big spark.
just stay upside down as long as possible while in the air
only if you plan on having climate control down there..
The hardest one, spend some time upside down while in the air
Scroll down to related links and look at "Damping of Air of High Frequencies (Dissipation)".