Can AgI be used as an artificial rainfall agent?

There are four methods of artificial rainfall, cooling, crystallizers, hygroscopic agents, and water mist. Among them, silver chloride is mainly used as a crystallizer.

Artificial precipitation. It can cause flooding and traffic jams. The basic method is to spread refrigerants (such as dry ice, propane, etc.), crystallizers (such as silver iodide, lead iodide, resorcinol, tetraacetaldehyde, ferrous sulfide, etc.), hygroscopic agents (such as salt, urea, calcium chloride) and water mist to the cloud according to the nature of the cloud, so as to change the size, distribution and properties of cloud droplets, change or accelerate their growth process, and achieve the purpose of precipitation or cloud elimination.

Clouds are formed by the condensation of water vapor; The thickness and height of the cloud are usually determined by the amount of water vapor in the cloud, the number of condensation nuclei, and the temperature in the cloud. Generally speaking, the gelatinous state of water vapor in clouds is relatively stable and not easy to produce precipitation, and artificial precipitation enhancement is to destroy this gelatinous stable state. Usually artificial rainfall is to spread the catalyst (silver iodide) in the medium and low cloud systems with relatively large cloud thickness through certain means, so as to achieve the purpose of rainfall.

First, increasing the number of condensation nuclei in the cloud is conducive to the collision and increase of water vapor particles. The second is to change the temperature in the clouds, which favors disturbance and produces convection. The disturbance and convection in the clouds will be more conducive to the collision and increase of water vapor, and when the updraft in the air cannot withstand the floating of water vapor particles, rainfall will occur.

Artificial rainfall is to use aircraft, rockets and artillery to sprinkle dry ice, silver iodide, aluminum iodide, copper sulfide, resorcinol and urea in cold clouds, or use aircraft to sow hygroscopic substances such as salt, calcium chloride and ammonium nitrate or surfactants such as camphor and silicone in warm clouds, so as to achieve the purpose of rainfall. Artificial rainfall has a wide range of applications in the military. During the Vietnam War, artificial rainfall from the United States made it extremely difficult to transport war materials to the Vietnamese side.

Of course. Silver iodide and silver bromide are all acceptable. They are dropped high in the air by rockets or airplanes to provide condensation nuclei for water vapor.

Artificial rainfall agents are some chemicals that are used to artificially provide rain. Including silver iodide, cuprous iodide, dry ice, brine.

According to the different mechanisms of action, artificial rainfall agents are divided into three categories.

By absorbing moisture from the clouds, it causes it to form larger water droplets, such as salt water.

By cooling the clouds, it eventually causes the water vapor to condense into water droplets. For example, dry ice.

Nucleating agents, such as silver iodide.

Both can be used for artificial rainfall, but the principle is different.

1. Dry ice, solid CO2, mainly plays a role in cooling, so that the temperature of the clouds drops, the water vapor condenses into liquid and rains.

2. AGI has a crystal structure similar to ice, so after being sprinkled into supersaturated clouds, it becomes a condensation nucleus, which is convenient for the condensation of water vapor and forms large particles of raindrops.

The role of silver iodide in artificial rainfall is meteorologically known as cold cloud catalysis. As long as silver iodide is heated, it will form a very large number of very fine (only 1 to 1 thousandth of the diameter of a human hair) silver iodide particles in the air. 1

g Silver iodide can form tens of trillions of particles. These particles move into the clouds with the movement of air currents, producing trillions to tens of billions of ice crystals in cold clouds. Therefore, the use of silver iodide to catalyze rainfall does not require aircraft, the equipment is simple, the amount is small, the cost is low, and it can be promoted in a large area.