Heat is always associated with electric current. Since there is an enormous amount of current in a lightning strike, there is also an enormous amount of heat. In fact, a bolt of lightning is hotter than the surface of the sun. This heat is the actual cause of the brilliant white-blue flash that we see. This heat energy makes the air around the lightning bolt extremely hot. Immensely hot, that the air explodes as the heat energy expands the air. This explosion is what we hear as thunder.
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