Rain is one form of precipitation, or derived from space fluid, such as snow, hail, dew and fog. Rain forms when separate drops fell to earth from the clouds. Not all rain water to the earth's surface, some evaporates while falling through dry air, a type of precipitation that are recognized as virga.
Rain plays an important role in orbit hydrologik in which moisture evaporates from the sea, exchanged into the clouds, gathered into clouds, then fall back to earth, and finally returned to the sea through rivers and streams to repeat the original recycling.
Precipitation is often described as a form of "oval", width below and shrink above, but this is not appropriate. Precipitation of small nearly spherical. Large rainwater becomes increasingly flat, like hamburger buns; rainwater larger umbrella-shaped plunge. Rainwater falling faster large versus smaller rainwater.
Some cultures have formed hate to rain and has created various equipment such as umbrellas and rain clothes. Many people are also more like to stay indoors on rainy days.
Usually had higher levels of acid rain pH 6. Rain below pH 5.6, is considered acid rain.
Many people assume that the smell is considered to be kissed in the rain or a pleasant fragrance. The source of this odor is petrichor, oils produced by plants, then absorbed by rocks and soil, and then released into the air when it rains.
The types of rainBased on the occurrence, the rain can be divided into:1. Siklonal rain, the rain that occurs because hot air rises along with rotating winds.
2. Zenithal rain, the rain that often occurs in the area around the equator, a result of meetings with the Wind Pasat Northeast Southeast winds Pasat. Then the wind was rising and forming clouds around the equator resulting clouds become saturated and the rain descended.
3. Orographic rain, the rain that occurred because of wind that contain water vapor which moves horizontally. The wind was up into the mountains, the air temperature cools, causing condensation. There was rain in the surrounding mountains.
4.Frontal rain, the rain which occurs when cold air masses meet with a mass of hot air.Meeting place between the two masses are called fronts field. Because the heavier colder air mass at the bottom. In the vicinity of the front area of heavy rain is often the case, called the frontal rain.
5. Monsoon rains, the rain that occurred because of wind season (monsoon). The cause of the monsoon is due to the movement of the Sun's annual apparent between the Lines Behind the Lines Behind the North and South. In Indonesia, theoretically monsoon rains occur from October through April. While in East Asia occurred in May through August.
Based on grain size, the rain can be divided into:
1. Drizzle / Drizzle, grain diameter of less than 0.5 mmSnowfall, composed of ice crystals where the temperature is below 0 ° CelsiusHail, hail the trun flow in hot weather from the clouds where the temperature below 0 ° CelsiusHeavy rain / rain, the water flow down from the clouds with temperatures above 0 ° Celsius with a diameter of 7 mm ±Artificial rainOften water needs can not be met from natural rainfall. So people create a technique to increase rainfall by providing treatment in the cloud. This treatment is called artificial rain (rain-making), or often called cloud seeding (cloud-seeding).
Artificial rain is a human endeavor to enhance the precipitation falls naturally by changing the physical processes that occur inside the cloud. Physical processes that can be changed include the collision and merging processes (collision and coalescense), the process of ice formation (ice nucleation). So it is clear that the artificial rain was not creating something out of nothing. To apply the effort required the availability of artificial rain clouds that have a sufficient water content, so the rain can occur to the ground.
Materials used in the artificial rain is called seedling material.
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