Why is there always a thunder after lightening?

Question

can someone explain that????

Answer 1

Lightning causes sudden heating which causes the air to expand faster than the speed of sound, this compresses the air and a shock wave results.  This is what is known as thunder.

Answer 2

When lightning occurs,it heats the air around it to an incredible 30000 degree celcius,five times hotter than the surface of the sun.This heat causes the air to expand very fast;i.e.,faster than the speed of sound.It is this which causes the crash of thunder immediately after the lightning (or at the time of lightning).

Answer 3

thunder is caused by the sudden heating of the air by lightning.  the heat makes molecules of air along the lightning's channel expand and collide with cool molecules. this sets up a wave which creates the rumbling sound of thunder. hence lightning first because light travels faster than sound.

Answer 4

Because the lightening heats up the air that expands outwards (sound wave). Count of in seconds between flash and sound then seconds/5 = distance off in miles