Facts About Thunder
Thunder is the sound caused by lightning.
The intense heat from lightning causes the surrounding air to rapidly expand and create a sonic wave that you hear as thunder.
The average temperature of lightning is around 20000 °C (36000 °F).
The sound of thunder can be anything from a loud crack to a low rumble.
The closer you are, the shorter the gap between the lightning and thunder.
The speed of sound is around 767 miles per hour (1,230 kilometres per hour).
The speed of light is around 669600000 miles per hour (1080000000 kilometres per hour).
Thunder is difficult to hear at distances over 12 miles (20 kilometres).
Thousands of years ago philosophers such as Aristotle believed that thunder was caused by the collision of clouds.
Astraphobia is the fear of thunder and lightning.