"Rain"

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Rain or rainfall or waterfall is a wet precipitation and belongs to the watery weather waterfalls or water meter as called the various phenomena of the precipitation, of which other species are also snowwater, snow, and hail.

For the phenomenon to occur on Earth, it needs a dense layer of atmosphere with a temperature above the melting point of water (i.e. above 0 °C) relatively close to the surface of the Earth. The concentration of atmospheric water vapours must be high enough for them to liquefy and form drops of liquid water, heavy enough to fall to the surface. Overall, three possibilities (and their combinations) are required to cause rain:

Cool the air, i.e. reduce its temperature, to reduce its ability to contain water vapor in gaseous form or in the form of small (wet) droplets in colloidal dispersion ( clouds).
Increase atmospheric pressure to reduce its ability to contain water vapor in gaseous form or in the form of small droplets in colloidal dispersion ( clouds).
Increase moisture concentration to exceed its containment capacity for this temperature and pressure.

In some extreme situations of very dry atmosphere, raindrops evaporate before reaching the surface. Water droplets unite into larger ones through the collision between them in the clouds. The final size of the drops varies. Normal rain, in a relatively unpolluted atmospheric area, has a pH of 5.2 as a rule, making it slightly acidic.

Oversaturation of moisture is associated with weather fronts, which are the main method of forecasting upcoming rainfall. If there are enough humidity and rising air currents in a place, then rain falls into thin drops. In mountainous areas, it is very likely that heavy rains will fall on the side that has access to liquid air. Instead, a dry to desert climate is often formed on the windy side.

Description

The variety of life, as well as the good fruitage of the Earth depend on the amount of water that will fall to Earth. Rainwater is not entirely clean, especially in industrial areas. Because the water has many solvent properties, it even dissolves the gases found in the atmosphere and this has the effect of having an acid taste, hence the term "acid rain". Also, as it falls, it lures other substances that do not dissolve into water or fail to dissolve. Thus, the rain during its fall lures dust, smokes, and other components that pollute the atmosphere. And this is understood by the muddy remains with which objects, such as cars, etc., are soiled when they are in uncovered spaces.

Sometimes the rain is reddish. Such rain is also observed in Greece as in other Mediterranean countries, also known as "haematoid rains". These are due to winds