Product Name: KX1901 Thunder and Lightning
Product Code: KX1901
Size: 570*85*85mm
Weight: About 160g
Material: Paper tube + cup + spring + electronic lamp + double-sided tape.....
Packing: 65 pcs
Box Specification: 600*500*450mm

One summer afternoon, suddenly the sky became dark with clouds, a lightning bolt flashed, followed by a loud thunderclap, and it started to pour heavily. Why do we see the lightning before we hear the thunder? Why does it only happen in summer and not in winter? Let's do this experiment to find out!

1. Why should electrical appliances be turned off during a thunderstorm? Lightning can cause a momentary high voltage in electrical wires. This high voltage can potentially destroy electrical components, which can lead to serious damage, such as explosions, or minor damage, such as burning out fuse boxes. Therefore, if you live in an area where thunderstorms are severe, it is sometimes necessary to even turn off the lights because they can suddenly explode and harm people nearby. Of course, if the thunderstorm clouds are high up, there will be no impact. Generally, the thunder that sounds more frightening comes from lower clouds, and at this time, it is necessary to turn off the equipment.
The necessary conditions for lightning to occur are: 1. The air must be very humid; 2. The clouds must be large and dark, usually cumulonimbus clouds; 3. Areas with dry weather generally do not have lightning. Lightning and thunder occur simultaneously, but they travel at very different speeds in the atmosphere, so people always see the lightning before they hear the thunder. Light can travel about 300,000 kilometers per second, while sound can only travel 340 meters per second. Based on this phenomenon, we can calculate the distance to the lightning by measuring the time from seeing the lightning to hearing the thunder. If the lightning is in the northwest, and thunder is heard 10 seconds later, it means that the thunderstorm is about 3,400 meters away from us.

Knowledge Expansion:
Cumulonimbus - Lightning generally occurs in cumulonimbus clouds with vigorous convection, so they often accompany strong gusts and heavy rain, and sometimes hail and tornadoes. The distribution of charge in cumulonimbus clouds is relatively complex, but overall, the upper part of the cloud is dominated by positive charge, and the lower part is dominated by negative charge. Therefore, there is a potential difference between the upper and lower parts of the cloud. When the potential difference reaches a certain degree, an electrical discharge will occur, which is the common lightning phenomenon we see. Lightning has a high voltage, about 100 million to 1 billion volts. A moderate intensity thunderstorm can reach 10 million watts, equivalent to the output power of a small nuclear power plant. During the discharge process, the high-temperature arc in the lightning channel can cause the surrounding air to expand rapidly, and then cool, causing the air to contract rapidly, causing violent acoustic vibration, which is the thunder we hear. When a charged thundercloud approaches a ground protrusion, an intense discharge will occur between them. At the location of the lightning discharge, there will be a strong flash and a loud explosion, which is the lightning and thunder that people see and hear.