q The lighting stroke can heat the air through
which it travels to 30,000C (54,000F), which is 5 times hotter than the surface of sun.
qThis extreme heating
causes the air to expand explosively, thus
initiating a shock wave that become a booming sound
wave (thunder) to travel outward.
q It takes 3 seconds for thunder to travel 1
km (5 seconds to travel 1
mile).