Artificial rain by seeding clouds made ??using material that is hygroscopic (absorbs water) so that the grain growth process in the rain clouds will increase and will further accelerate the occurrence of rain. Cloud is used to make artificial rain is kind of cloud Cumulus (Cu) that looks like cauliflower. Once the location is known clouds, planes carrying special powder to fly to the clouds to rain.
The special powder composed of silver iodide glasiogenik form. Substance that serves to form ice. The aircraft also carries the powder to "merge" the drops in the cloud which is hygroscopic like salt or sodium chloride (NaCl), or CaCl2 and urea.
To be able to form a heavy rain, it usually takes as much as 3 tons of special powder that sowing to the Cumulus cloud for 30 days. Oh yes, the process of making artificial rain is not necessarily successful loh. Can fail or even a homemade rain falls in the wrong place when it was a big cost to manufacture. Therefore, the spread of seed rain should pay attention to the wind direction, humidity and air pressure.
Good luck!
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