How does it become possible to cause
Question:

 How does it become possible to cause artificial rain by spraying silver iodide on the clouds?

Solution:

Clouds carry a charge as they are colloids. Silver iodide AgI being an electrolyte helps in coagulation process between colloidal particles of water in the cloud. Thus it

forms bigger raindrops causing artificial rain. AgI is usually sprayed from an aeroplane or remote-controlled rockets.

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