Product name: KX1901 thunder and lightning
Item no: KX1901
Size: 570 * 85 * 85 mm
Weight: approx. 160g
Material: paper tube + cup + spring + electronic lamp + double-sided adhesive tape...
Packing: 65 PCS
Rules: 600 * 500 * 450 mm

One summer afternoon there was a sudden gathering of dark clouds, a flash of lightning, and then a loud thunder, rain, why is it first see the lightning, then can hear the thunder that? Why only in the summer when there is no winter? Let's do this experiment together to find out!

1. Why do you turn off electrical appliances when it's thundering? Thunder has the opportunity to create a transient high voltage on the wire. At this time, the high pressure may break through the electrical components, which may cause an explosion in the severe case, and may also burn the fuse in the mild case. So if it's thundering hard in an area, sometimes even the lights have to be turned off, because it can burst on and hurt people nearby. Of course, if the clouds are high, it doesn't matter. Generally those sounds more frightening thunder, the clouds are lower, this must be shut down
2. Necessary conditions for the occurrence of lightning: 1. The air should be very humid; 2. Clouds must be large and dark; Usually cumulonimbus; 3. Dry weather areas are generally not prone to lightning. Lightning and thunder happen at the same time, but their velocities vary widely in the atmosphere, so people always see the lightning before they hear it. Light travels about 300,000 kilometers per second, while sound travels only 340 meters. According to this phenomenon, we can calculate the distance of the lightning from us from the time we see the lightning to the time we hear the thunder. If the lightning is in the northwest and the thunder is heard every 10 seconds, the thunderstorm is about 3,400 meters away from us.

Knowledge development:
Thunderstorms and thunderstorms generally occur in cumulonimus clouds where convection is strong, and are often accompanied by strong gusts of wind and heavy rain, sometimes accompanied by hail and tornadoes. The distribution of charge in cumulonimbus is more complicated, but generally speaking, the upper part of the cloud is dominated by positive charge, while the lower part is dominated by negative charge. Therefore, a potential difference is formed between the upper and lower parts of the cloud, and when the potential difference reaches a certain degree, it will produce a discharge, which is our common lightning phenomenon. Lightning has a high voltage of about 100 million to 1 billion volts, and a moderate thunderstorm can produce 10 million watts of power, equivalent to the output of a small nuclear power plant. In the process of discharge, the high temperature of the arc in the lightning channel can make the surrounding air rapidly expand, heat disappeared and cooling, make the air rapidly contract, causing violent sound vibration, so we heard the thunder. When charged thunderclouds come close to bumps on the ground, intense discharges occur between them. At lightning discharge points, there are intense flashes of light and the roar of explosions, the thunder and lightning that people see and hear