Since its appearance in 1946, the technology of artificial rain has been widely applied in many countries around the world to help combat droughts, reduce air pollution, serve important events .

As of 2015, 52 countries around the world have used artificial rain technology.

The rain is formed by spraying a small amount of chemicals (silver iodine or carbon dioxide) to stimulate the air masses to rise, resulting in condensation. After that, people use planes or rockets . impact on this condensing block causes imbalance and creates water particles.

Aircraft supports the process of creating artificial rain.(Photo: gizmodo).

America

The snowfall near Schenectady, New York City's suburb in 1946 was the opening event for the technology of creating artificial rain in the world.

According to Artificialclouds, the dry states in the US, typically California, conducted artificial rain with silver iodine in the 1960s. When water scarcity became more severe, other states like Colorado, Georgia, Hawaii . also applies, while states like New York or Washington still have legal disputes related to this technology.

In the United States, local governments often hire companies to control artificial rain-causing weather for the purpose of increasing rainfall and water supplies. Projects that increase rainfall are paid by consumers through a surcharge on water bill. They consider this one of the ways to provide less expensive water.

Russia

In 2015, Russia spent more than US $ 6.6 million to ensure that it was completely free from the 70th anniversary of World War II, according to Moscow Times.

Russia's Red Square was completely empty during the military review ceremony to celebrate the fascist victory.(Photo: AP).

Before the Red Square parade took place, a Russian air force squadron flew from the northern Moscow base from 6 am to spray the chemical mixture into the clouds at an altitude of 8,000 meters, causing rain. Previously in the surrounding areas, rain in the center of the Russian capital was avoided.

The central representative of the statue of Russia said that the technique of causing rain in this way does not affect human health and the environment.

A year earlier, the Moscow government spent nearly $ 4 million on "ensuring good weather" for the city during the holidays of May.

Japan

The phenomenon of rainfall scarcity in the second half of 2013 has affected the lives of people throughout the Kanto region, east of Honshu island, including six Japanese provinces and Tokyo.

In August 2013, the Tokyo city government, on a trial basis, produced artificial rain to cope with the lower average water level in the reservoir of the Tama River, Japan Times said.

Ground generators have been used in the Okutama area, west of Tokyo, and Koshu, Yamanashi province, to bring silver iodine mixed with acetone into the air to create moisture. When this vapor mass reaches a height of 4,000 to 5,000 meters, the initial mixture freezes and condenses in the clouds, creating rain.

Eventually, the rain appeared in the upper Ogouchi dam on the Tamagawa River with rainfall at 10mm.

China

The world's most populous country produces 55 billion tons of artificial rain each year, according to 2013 statistics and became the most spending country for this technology. The purpose of creating artificial rain in China is to combat drought, hail and air pollution.

Artificial rain technology has been used since 1958 and has become one of the most important measures in strengthening China's disaster monitoring and response.

One of China's artificial rain-causing devices.(Photo: AP).

In particular, on the Beijing 2008 Olympics, more than 1,000 silver iodine missiles were fired into the sky from 21 different locations in the capital for a total of more than 7 hours.

Efforts to dispel the rain and rain before the opening ceremony helped "wash the city" and keep Beijing dry later, while the areas around the capital and suburban centers have little rain.

Malaysia

In September 2015, Malaysia prepared a mixture to spray artificial precipitation to reduce air pollution caused by forest fire, Borneo Post reported.

The Malaysian Meteorological Bureau's Center for Cloudy and Atmospheric Research said the agency works with the Royal Malaysian Air Force to make artificial rain in the Klang Valley and Kuching areas.

Malaysian experts mix salt mixtures, mainly NaCl, to load into aerosols and transfer them to Malaysian military aircraft to be ready to spray on the clouds.

Malaysian soldiers spray salt into the clouds.(Photo: The Star).

After the aircraft reached an altitude of 1,200 m to 2,100 m depending on the region and weather conditions, Malaysian air force soldiers sprayed the solution into the cloudy areas. Spraying salt into clouds increases the condensation of water particles, thereby increasing the ability to create rain.

Malaysia has applied artificial rain since 1979 to stamp out large forest fires or reduce air pollution. Representatives from the Malaysian Meteorological Bureau said that each flight made of artificial rain could cost about 7,500 USD.

Thailand

Earlier this year, in the context of the greatest drought in decades, Thailand decided to send the Royal rain-generating force to impact the clouds to rain the country.

Global Express News cited Thai scientist Wiraphon Sudchada as saying that the process of precipitation begins with spraying salt powder into clouds. They then mix and spray the mixture of calcium chloride and calcium oxide into those clouds to increase the size. Experts also sprayed ice below the clouds to rain faster.

This is not the first time Thailand has applied artificial rain technology. The Thai king has been running artificial rain projects since the late 60s of the last century.

United Arab Emirates (UAE)

As one of the most arid regions in the world, the United Arab Emirates has long focused on measures to increase annual rainfall, including artificial rain applications.

Chemical cannons are attached to aircraft wings.(Photo: waterworld).

Technologies used by the UAE to create rain can be mentioned as: ion generation, cloud breeding, artificial mountain construction projects. In that cloud breeding project received the cooperation of the US Aerospace Agency (NASA).

Through these technologies, artificial rain can occur due to the electric current bringing moist ions to the upper layer to form areas of moist cumulonimbus or chemical cannons that are fired into the clouds at the appropriate time through radar monitoring. Private artificial mountains can help push air up high, creating rain clouds .

According to the UAE National Center for Atmospheric Research, about $ 558,000 was invested to create artificial rainfall throughout the country last year.