Lightning Is Extremely Hot

While the Sun's surface is our solar system's benchmark for extreme heat, the air within a bolt of lightning is dramatically hotter. This incredible temperature isn't generated by fire, but by electrical resistance. As a massive electrical current surges through the narrow channel of air between a cloud and the ground, it encounters resistance, converting electrical energy into thermal energy at an astonishing rate. This process instantly heats the air in the lightning channel to around 30,000 Kelvin, turning it into a superheated state of matter known as plasma.

The direct result of this instantaneous, intense heating is the sound we know as thunder. The column of air around the plasma channel expands violently, moving outward faster than the speed of sound and creating a powerful shockwave. It is this shockwave, not the electricity itself, that our ears perceive as the sharp crack or low rumble of thunder. The sound is a direct auditory consequence of the air being violently superheated in a fraction of a second.

This immense energy leaves its mark on the planet in other ways, too. When lightning strikes sandy soil, the heat is so intense that it can instantly melt and fuse the sand particles along its path. This creates hollow, glassy tubes called fulgurites, sometimes referred to as "fossilized lightning." These delicate structures serve as a tangible record of the incredible thermal power unleashed by a single strike, an event that occurs over 8 million times across the globe each day.