The sound caused by lightning is known as thunder. The sound ranges from a sharp, loud crack to a long, low rumble, depending on the distance and nature of the lightning. Due to the sudden increase in temperature and pressure during lightning, the air within and surrounding the path of lightning strike rapidly expands. This expansion of air creates a sonic shock wave, which is often referred to as ‘thunderclap’ or ‘peal of thunder’.
The sound of thunder falls into different categories based on the loudness, pitch and duration as follows: