Thunder

Thunder is the sound caused by lightning. Depending on the nature of the lightning and distance of the listener, thunder can range from a sharp, loud crack to a long, low rumble (brontide). The sudden increase in pressure and temperature from lightning produces rapid expansion of the air surrounding and within a bolt of lightning. 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, or peal of thunder. The distance of the lightning can be calculated by the listener based on the time interval from when the lightning is seen to when the sound is heard.

Read more about Thunder:  Cause, Etymology, Calculating Distance

Famous quotes containing the word thunder:

    Lies save trouble now, but may return in thunder and lightning.
    Mason Cooley (b. 1927)

    Small, black, as flies hanging in heat, the Boys,
    Until the distance throws them forth, their hum
    Bulges to thunder held by calf and thigh.
    Thom Gunn (b. 1929)

    Of late, eternal Condor years
    So shake the very Heaven on high
    With tumult as they thunder by,
    I have no time for idle cares
    Through gazing on the unquiet sky.
    Edgar Allan Poe (1809–1849)