What are the main coagulants of artificial rainfall? What are the pros and cons of each?

When we spray these catalyst materials for artificial rainfall into the air, will they have an impact on the air and human health?

First of all, we need to understand that in clear, clean air, there are an average of 1,000 suspended particles per cubic centimeter, and about 100,000 in heavily polluted air. These particles are also uneven in size, with diameter distributions ranging from microns to 10 microns. A large project of artificial rainfall will increase particulate content in clean air environments by 15 in a very short period of time, increasing particulate content in polluted air environments.

Catalyst cores sprayed into the air will quickly enter the set clouds and fall with the rain they produce. Analysis has shown that if we inject silver iodide particles into a cloud and collect the resulting rainfall, if this rainwater is drunk by a person, the amount of iodine absorbed by him will be equal to the amount of iodine absorbed by eating salted eggs for breakfast. This is perhaps best illustrated by the fact that in an area that requires artificial rainfall, it needs 500 1-kilogram flares per quarter, while at the same time local industrial production can emit about 60 tonnes of waste into the air every day of the year.

Moreover, the catalysts we typically use in artificial rainfall are dry ice (solid carbon dioxide) or potassium chloride, which is an inherent gas in the air, and the amount of potassium chloride (a substitute for salt products) released into the air is negligible compared to the amount of salt produced by evaporation from the ocean. Therefore, on the whole, the catalyst released by artificial rainfall does not have much impact on the atmospheric environment and human health.

Artificial rainfall should be carried out when the clouds are rich in water vapor.

There are two methods of artificial rainfall: one is to spread coolant by aircraft; The second is to fire a cannon or launch a rocket into the clouds, generating a powerful shock wave.

At present, there are two main catalysts used in artificial rainfall in China: one is dry ice, which cools the surrounding air layer to tens of degrees below zero when vaporized, thereby causing the condensation of water droplets; The second type is silver iodide, which has first-class "rain-making" skills. Dry ice is actually carbon dioxide.

Silver iodide, on the other hand, is extremely low toxicity as a chemical. In addition, silver iodide is very efficient in making ice crystals, and usually a cumulonial cloud can be effective by spreading a dozen or dozens of grams, and the amount of silver iodide is very low, almost negligible, so it will not cause any pollution.

Almost negligible.

Silver iodide or dry ice that doesn't work well can also lead to poisoning, as those substances can enter the body, but the probability is very low.

disturbing normal changes in the atmosphere; polluting the environment; increase consumption and increase burden; intercepted rainwater from other places, creating contradictions between regions; Sometimes it causes strong convection, localized hail.

1. Dry ice sublimation and heat absorption effect is obvious.

2. There is no harm to the human body.

3. Replenish water for crops and alleviate drought.

4. Control the amount of precipitation.

Alleviating drought.

Heat dissipation can control the amount of precipitation.

There is no harm to the human body.

Dry ice is expensive, and planes have to fly over the clouds, but it is relatively safe and pollution-free. Silver iodide is risky (it is often found that rain shells injure people, the height of the cloud is required, as if below 3000 meters, and there is no pollution, silver iodide light decomposes into iodine and silver, if eaten by mistake, silver chloride precipitation will be produced, which is not absorbed by the human body.

Lidu sublimates and absorbs heat to liquefy water vapor into small water droplets.

Lidu can increase rainfall and ensure the normal growth of crops.

The disadvantage of dry ice is that it releases carbon dioxide into the atmosphere, and the disadvantage of aggravating the greenhouse effect of silver iodide is that it causes heavy metal pollution.

Dry ice is a sublimation of heat absorption, is the liquefaction of water vapor to rain, silver iodide plays a role in condensation (which is equivalent to letting countless small raindrops gather together and fall) pros and cons generally do not take the test, I haven't seen the test in three years of high school!

Dry ice is carbon dioxide, and it requires a pilot to fly an airplane to spread it at high altitudes, so it can be dangerous.

There is no safety hazard with silver iodide, but it is costly.

The principle is that they need to absorb heat and sublimate to allow water vapor to condense and rain.

Artificial rainfall is based on the physical characteristics of different clouds, choose the right time, use airplanes, rockets to sow dry ice, silver iodide, salt powder and other catalysts into the clouds, so that the clouds precipitation or increase precipitation, so as to relieve or alleviate the drought of farmland, increase the irrigation water or water supply capacity of reservoirs, or increase the amount of power generation. China's earliest experiment with artificial rainfall was in 1958, when Jilin Province was hit by a drought not seen in 60 years.

Simply put, a catalyst (e.g. dry ice) is put into the clouds to produce rainfall.

Artificial rainfall is the introduction of a catalyst into the clouds.

I'm man-made, not weather rain.

People use certain technology to make it rain.