The rain can be uncomfortable. Us wet, makes us sad and can ruin special days. It is not in fact no coincidence that there are companies that charge for sure that it will not rain on your wedding day. But If there is something worse than the rain is the lack thereof, and so every time there are more countries that invest money in the cloud seeding.
Although it may seem like something out of a science fiction book, the truth is that We have more than fifty years seeding clouds and making it rain or snow in certain places in artificial way. There are many companies and Governments investing money to develop different techniques to achieve it, although all of them have a common origin.
Who can love rain?
But what make it rain? The reasons are the most varied, from politicians who want it may seem that they are helping more farmers to fight fires or the obvious needs of those areas of the world suffering from continuous droughts that are leaving in misery to thousands of people.
In July 1946, the chemist and meteorologist American Vincent Schaefer was the first to get to produce artificial snow. Did getting dry smell (CO2 in solid phase) in a refrigerator to cause a temperature drop, but he realized that the chilled water in the air was forming clouds of ice crystals. Shortly thereafter he developed his technique and was also able to make it rain outdoors.
There are up to 34 companies dedicated to sow rain
Since then they have created up to a total of 34 companies around the world who live weather modification. Are also using these techniques governments like the Chinese, Vintage clouds in 22 of its 23 provinces to combat pollution in big cities as well as to improve the rains for agriculture.
Years ago there were several discussions about if it rains in a city was stealing rain to another to which directed that cloud, but today as Dave Reynolds American meteorologists have it clear: “clouds are continuously regenerated, and emerge only from a portion of its moisture when it rains”. Translated into plain language, that means that cause precipitation It does rain less in other places, but more rain in several places.
How can I make rain?
Depending on the weather and location there are several different ways to perform the cloud seeding. The most common are that uses substances such as silver iodide, or which uses dry ice or frozen carbon dioxide. To ensure effectiveness It is necessary that the cloud contains water supercooled or below zero degrees liquid.
The substance such as silver iodide has a structure similar to the ice crystal-shaped, and acts causing a nucleation of crystals of ice from these drops of water. Using dry ice does not lack that there is water for being a material that expanded, cools the air to create ice from the steam. Even so, it is necessary to be necessary if what we want is that those ice crystals grow as well as to create precipitation.
These techniques are concerned some people because the iodide of silver in high concentrations can be harmful to health. But in United States studies have determined that the amount of this compound in the snowflakes created artificially It is so small that it is practically undetectable. In fact detected greater quantities in places where even used techniques of harvested from clouds.
Clouds using salt can be planted
In some other warmer areas such as La India is gaining in popularity make the cloud seeding using hygroscopic materials such as salt. The water molecules are attracted by the salt, so it serves to attract them, join them and create with them drops of water.
Employers who engage in such activities warn that their techniques are not a Holy Grail that cause rain from nowhere, and insist that “it is difficult to know if you can cause it rains as predicting the weather”, since There are never two equal clouds. Is also the problem that is missing that clouds, there are although it is already working on systems capable of creating clouds of rain using lasers.