Dry rain has long been discovered, but it is extremely rare. Why is the weather dry and easy to catch fire?

In recent years, astrophysicists all over the world are particularly interested in dry rain. Dry rain has long been discovered, but it is extremely rare. In recent years, it has been found that it appears more and more frequently. About/kloc-0.00 years ago, dry rain destroyed the entire fleet of Azores. A fire in Texas grassland was also caused by dry rain, and Savannah in Africa became a trophy of dry rain in A.D. 1889.

Because of the so-called waterfall fever, it is difficult to put out the fire caused by dry rain. When this kind of fire happens, we should not only put out the burning materials, but also make greater efforts to deal with the rain and the high temperature as high as 2000 degrees Celsius. For this kind of rain heat, water becomes a cooling substance. Therefore, in addition to water, special substance powder should be used to cut off the contact between heat source and oxygen.

At present, there are two views on the explanation of dry rain. One view is that some of the materials scattered by comets fall into the earth, leading to drought and rainfall. It takes 2 ~ 6 years from the dispersal of comets to the appearance of dry rain. At present, astrophysicists have observed more and more comet scattering, so scientists predict that there will be some dry rain in the next 6 ~ 15 years. By then, the number of dry rain fires will reach 8 per year and 30 per year in 50 years.

Another view is that the phenomenon of dry rain is another destructive activity of civilization that we have not yet known. On the surface, this idea seems unfounded, but those who hold this view believe that if the phenomenon of dry rain comes from the universe and is the product of comet scattering, chemists should be able to discover the chemical composition of comets through spectral analysis. But the research results of chemists in this field are still negative. ? In a word, the two statements have their own reasons, and further research is needed to confirm them.

In addition, the weather that causes grassland fires is as follows:

1, high temperature: the higher the temperature, the faster the evaporation rate of water in combustible materials, and dry goods are easy to catch fire.

2. Low humidity: In general, when the air humidity is less than 60%, there is a possibility of fire.

3. Less precipitation: the amount of precipitation is directly related to humidity, and the amount of precipitation is closely related to grassland fire.

4. Strong wind: Wind not only contributes to combustion, but also enables the fire source to obtain sufficient oxygen supply after the fire, thus accelerating the combustion.

Grassland area is large, the terrain is flat, and combustible materials are flammable. Once a fire breaks out, it will spread rapidly under the action of strong wind and be difficult to control. Due to the changeable wind direction in grassland areas, multi-pronged fire heads often appear, which spread rapidly and form fire circles. It is difficult to transfer people and animals, which can easily cause casualties and serious harm.