

K, then dropping away gradually to about 1. The temperature inside the lightning channel, measured by spectral analysis, varies during its 5. 0th century a consensus evolved that thunder must begin with a shock wave in the air due to the sudden thermal expansion of the plasma in the lightning channel.

9th century, the accepted theory was that lightning produced a vacuum. Subsequently, numerous other theories were proposed. The first recorded theory is attributed to the Greek philosopher Aristotle in the fourth century BC, and an early speculation was that it was caused by the collision of clouds. The cause of thunder has been the subject of centuries of speculation and scientific inquiry. Problems playing this file See media help.
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A short sample of a crack of thunder during the sound of falling rain. In turn, this expansion of air creates a sonic shock wave, similar to a sonic boom, which produces the sound of thunder, often referred to as a clap, crack, peal of thunder, or boom. The sudden increase in pressure and temperature from lightning produces rapid expansion of the air surrounding and within a bolt of lightning. Depending on the distance and nature of the lightning, thunder can range from a sharp, loud crack to a long, low rumble brontide.

Thunder is the sound caused by lightning.
