Rain definition and facts:
Rain definition and facts are likely to discuss here in this case first of all we have to know what rain is?
The word rain means:
water falls from the sky, as water droplets gather together into one cloud, and after the cloud is filled with millions of drops, these drops fall on the ground.
When a small drop of water collides in the cloud with another large one, it unites with it, and as this process continues, the water drop becomes more and more heavy, until it reaches the weight that cannot move in the cloud and falls on the ground in what is called rain.
Human life depends on rain, as rain makes modern life easier for agriculture, industry, and electrical energy to depend on it.
That is why individuals, governments or institutions collect it for personal or public purposes.
Raindrops cluster around tiny particles known as cloud condensation nuclei, symbolized by CCN.
These particles may be particles of dust, salt, or smoke, or particles of polluting compounds,
Which may be brightly colored, such as red dust particles, or green algae, which gives color to raindrops.And because they are so small, we can rarely see these colors.
When Raindrops collect :
When raindrops collect around particles of polluting compounds, such as sulfur dioxide or nitrogen oxide, this leads to the formation of acid rain.
Acid rain :
Acid rain harms aquatic organisms and plants such as fish, frogs, and soil.Carbon dioxide or nitrogen dioxide is released, either naturally, such as erupting volcanoes, or artificially, such as fossil fuels.
The burning of fossil fuels:
The burning of fossil fuels affects the times of rain, in cities where vehicles are abundant and when they are driven throughout the week.
They release carbon dioxide or nitrogen oxide from the gas that these compounds emit, which leads to the formation of billions of CCN particles in the clouds.
By the end of the week, the clouds will be filled with nuclei particles of condensation and moisture, making it more likely to rain on the weekend than during the week.
Work of scientists on rain:
Scientists have developed what is called (raining) to collect in them (condensation nuclei) that lead to precipitation.
It is assumed that (raining) will reduce drought, but we don’t know if work continues on it or not.
Raindrops look like:
Most people think that raindrops look like tears, but are actually slices of chocolate.The smallest raindrops, which reach a diameter of one mm, are spherical in shape, but at 2 mm.
These drops begin to take on the surface shape, due to the force of the atmospheric pressure imposed on them while they fall on the ground.
This effect increases when they reach a diameter of 3 mm, but at 4 mm the shape of the raindrops is deformed and becomes an umbrella shape.
When it is about 4.5 mm in diameter, the raindrops are so large that they divide into two or more separate drops.
Diameter of raindrops:
Raindrops have a diameter of 0.5 mm (0.02 in), and the diameter of raindrops, which are water droplets smaller than raindrops, is smaller than 0.5 mm. Most of the clouds that fall are rain.
Raindrops often start out as blocks of snow, but melt as they fall into the atmosphere. Snow forms in the same way as rain, but in cold climates.
Ratio of rainfall :
Rain falls at different rates in different parts of the world. In dry desert areas, rainfall rates are less than a centimeter (0.4 inches) for a year, while rain forests reaches more than a meter (3.2 feet).
World Record of rain:
The world record for the most rain for one year was set in Cherrapunji, India, in 1861, with an average of 2,296 cm (905 in) rainfall.
Other types of rain:
Rain also forms on other planets, for example rain forms on Saturn’s moon, Titan, but it is not water droplets, but rather methane.
In 2009, a lot of rain fell on the surface of Titan, as a lake known as (New Methane Lake) was formed, which is four times the size of Yellowstone National Park located in the United States of America extending between states (Idaho, Montana and Wyoming).
Rain of living things:
Sometimes it doesn’t rain in the sky, but living creatures like small fish or tadpoles.
This phenomenon occurs due to hurricanes that occur over the ocean or lake, which may lead to drawing small aquatic animals with them.
And in 1984, the newspapers of Bath, England reported a tadpole rain. In 2009, in the city of Ishikawa, Japan, a rain of minnows fell.