Nonetheless, we all are aware that lightning is seen first, followed by the sound of thunder after few seconds. This phenomenon occurs as light wave travels much faster than the sound waves.
A lot of theories has been discussed concerning causes and creation of thunder. In the third century BC, it was believed that thunder is caused due to collision of clouds. However, the most accepted theory was conceived in the 20th century.
When the high temperature bolt hits the surrounding air, a sudden rise in temperature takes place. It brings along an instant expansion of heated air in the outward direction. The elevated pressure is obvious due to compression of heated air. The rapid expansion of compressed air then sends out shock wave or vibration, which we hear as a sound of explosion.
In case, you are outside during a thunderstorm, it is advisable to avoid open fields, beaches and lakes, and also stay away from tall trees. The safest way is to get inside your home or stay in the car. In the latter situation, you should not touch metal, as it is a good conductor of electricity.