Eli5: What happens when a lighting goes off?

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I mean, what happens to the immediate area of the lighting? In the “openness” basically…

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The lightning bolt is “plasma” – basically, the air has been heated to a point where it’s a phase of matter even beyond gas. The quick appearance and disappearance of that plasma, along with the immense amount of heat it generates, causes the air around the plasma to rapidly heat and expand and then contract again, causing the sound of thunder.

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