Lightning does not belong to light. Lightning is a strong discharge phenomenon between clouds, between clouds and the ground, or between different parts of clouds.
The length of lightning may be only a few hundred meters (the shortest is 100 meters), but the longest is also several kilometers. The temperature of lightning varies from 17000 degrees Celsius to 28000 degrees Celsius, which is 3~5 times the surface temperature of the sun. The extreme heat of lightning caused the air along the way to expand violently. Air moves very fast, so waves are formed and sounds are made.
Extended data:
Seeing lightning with the naked eye is very complicated. When the thunderstorm cloud moves somewhere, the middle and lower part of the cloud is the center of strong negative charge, and the underlying surface opposite the cloud bottom becomes the center of positive charge, forming a strong electric field between the cloud bottom and the ground. With more and more charges and stronger electric field, a section of air column with strong atmospheric ionization first appears at the bottom of the cloud, which is called cascade leader.
This ionized gas column extends to the ground step by step. The leader of each step is a dim light beam with a diameter of about 5 meters, a length of 50 meters and a current of about 100 ampere. It extends to the ground step by step at an average high speed of about 150000 m/s. When it was about 5-50 meters from the ground, the ground suddenly counterattacked. The channel of counterattack is from the ground to the bottom of the cloud, along.
The return stroke galloped from the ground to the bottom of the cloud at a higher speed of 50,000 km/s, emitting an extremely bright beam, which lasted for 40 microseconds, and the current passed through exceeded 10000 amps. This was the first lightning strike.
References:
Baidu encyclopedia-lightning