In
today's modern world of science, it is a scientific fact that we still can't
believe that artificial rain can be made even in non-rainy seasons. Usually,
the reason a government pours artificial rain is not just for water needs.
Rains are needed to relieve excessive dryness and remove pollutants from the
air. In arid countries like Dubai, when it doesn't rain, the amount of
contaminants in the air increases, so they make it rain.
Due to the solar heat in the water levels,
clouds with water droplets are formed due to evaporation and rise. When these
clouds cool down due to the cold air, the smallest water droplets in them
combine and become large water droplets which fall as rain on the earth which
is natural precipitation.
During
periods of extreme drought in the rainy season, scientists find clouds of tiny
water droplets in the sky and use aeroplanes to spray chemicals such as sodium
chloride and silver iodide into these clouds.
These chemical substances form small water
droplets in the cloud, due to which the small water droplets combine to become
large water droplets and fall on the earth as rain, this is what we call
artificial rain.
Dry clouds are usually found in the sky at an altitude of about 300 to 1000 meters above the earth's surface. Small water droplets, ten to 20 microns in size, take about two days to reach the Earth.
Chances
are these clouds will dissipate by then. These mangroves are sprayed with
chemicals like sodium chloride and silver iodide and these chemicals attract
water fleas.
Ten
to 20 micron size water droplets merge into larger water droplets and when
these water droplets reach 250 micron size, rain becomes drizzle. When the size
of this liquid becomes 500 to 600 microns, it rains heavily.
Success
in artificial rain research depends on the amount of moisture in the air, wind
speed, and the amount of water in the clouds.