Answer:
Clouds represent the colloidal
solutions of water drops in air (liquid in gas type). These drops are expected
to carry some charge (positive or negative). In order to neutralize the charge
on these, charged dust particles carrying opposite charge are sprayed over a
certain layer of cloud. These will neutralize the charge on water droplets
resulting in their coagulation. The bigger water drops can no longer be
retained by the atmosphere and will result in the artificial rain.
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