How does lightning occur when air is an insulator
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When the electric field is high enough, the air partially ionizes, at which point there are free electrons to carry current and the air becomes, essentially, conductive. ... So with large voltages it is possible to generate electrons that can move freely in a gas and conduct electricity - as in the example of lightning.
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The air get ionised. So, there are electrons to transfer the light energy down the earth's surface.
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