During a storm, there is a discrepancy between areas of air between regions of warm and cold. This causes frictional forces to build up, which sometimes creates an electrical spark. This is lightning.
At the same time, sound energy is produced by the friction between the different regions of air. This is heard a few seconds later as a clap of thunder. Thunder always follows along a little later because light travels faster than sound.
The speed of light in air is 299,792,458 metres per second (or 1,079,252,848.8 km h-1). The speed of sound in air is At sea level, at a temperature of 15 C (59 F) and under normal atmospheric conditions is 340 m s-1 (1225 km h-1or 761 mph).
The electrical discharge created by a bolt of lightning can be very destructive and it can kill. When caught outside in a storm, it is a good idea not to act as a lightning conductor ~ crouch down away from trees at the bottom of a slope if there is no shelter. But there is no need to cover your ears ~ the thunder is completely harmless.
At the same time, sound energy is produced by the friction between the different regions of air. This is heard a few seconds later as a clap of thunder. Thunder always follows along a little later because light travels faster than sound.
The speed of light in air is 299,792,458 metres per second (or 1,079,252,848.8 km h-1). The speed of sound in air is At sea level, at a temperature of 15 C (59 F) and under normal atmospheric conditions is 340 m s-1 (1225 km h-1or 761 mph).
The electrical discharge created by a bolt of lightning can be very destructive and it can kill. When caught outside in a storm, it is a good idea not to act as a lightning conductor ~ crouch down away from trees at the bottom of a slope if there is no shelter. But there is no need to cover your ears ~ the thunder is completely harmless.