Question

Air is a poor contuctor of electricity.But during lightning,anelectric current passes through air .... why???

Answer 1

hey friend

this question might be little confusing but  there's a simple answer for it 

we know that air is a bad conductor of electricity.
but sometimes in adverse conditions such as thunderstorm. the kinetic energy increases because the clouds continuously come in contact with each other generating current. 
if the amount of voltage is high then air will allow electricity to flow through it.

hope you like my answer :)

Answer 2

Air is a poor conductor of electricity but it losses it's insulting property when lightning passes through them because due to high heating effect of lightning, the heat causes the thermal expansion which causes the air in low pressure, and the electricity easily pass .
J J Thomas uses this property of low pressure of dry air to pass cathode ray, simply charged rays or negative charge rays, he also write book on it "condunction of electricity through gases " and dry air easily became electicfied and low pressure does not cause imbalance of electric current between them.
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