There are two basic conditions for the formation of clouds: one is sufficient water vapor, and the other is air cooling with condensed water vapor. Both conditions are indispensable.
With a lot of water vapor and air cooling, water vapor can't condense to form clouds. At this time, another condition is needed to promote the condensation of water vapor.
If the air is absolutely pure without any impurities, water vapor molecules will not adhere. Single water vapor molecules have little ability to merge with each other under general temperature conditions, and often separate after collision. Even the water droplets formed by polymerization, the water vapor molecules are very small, and the formed water droplets are also very small, so they evaporate quickly. In order to condense water vapor, there must be condensation nuclei to make water vapor adhere and gather. There are a lot of tiny particles in the atmosphere, such as salt particles, smoke particles and dust, which play a central role in the process of water vapor condensing into water droplets. Meteorology calls these tiny particles condensation nuclei.
Condensation nuclei are very small, much smaller than cloud droplets (water droplets or ice crystals in clouds) and raindrops. Generally, the raindrop radius is 1mm, the cloud drop radius is11000 mm, and the condensation core radius is only110000? /FONT & gt； L/ 1000 mm, and the radius of human hair is about 5/1000 mm. From these figures, we can get a more intuitive impression that the coagulation nucleus is much thinner than human hair.
When there is enough water vapor, the upward movement cools the air and condenses, clouds will naturally form.
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Starchy things during weight loss Question 3: How are clouds formed in the sky? Water vapor rises and condenses when it is cold.
Question 4: How are clouds formed? Clouds floating in the sky are made up of many tiny water droplets or ice crystals, some of which are mixed together. Sometimes it also contains some big raindrops and ice particles. The bottom of the cloud does not touch the ground and has a certain thickness.
The formation of clouds is mainly caused by water vapor condensation.
As we all know, the closer to the ground, the higher the temperature in the atmosphere more than 10 kilometers from the ground, and the denser the air. The higher the altitude, the lower the temperature and the thinner the air.
On the other hand, the water surface of rivers, lakes and seas, as well as the moisture of soil, animals and plants, evaporate into the air at any time and become water vapor. After water vapor enters the atmosphere, it turns into clouds to cause rainfall, or condenses into frost dew, and then returns to the ground, permeates the soil or flows into rivers, lakes and seas. Later evaporation (sublimation) condensation (condensation) drops. It goes on and on.
After the water vapor enters the lower atmosphere from the evaporation surface, the temperature here is high and there is much water vapor. If the hot and humid air is lifted, the temperature will gradually decrease, and when it reaches a certain height, the water vapor in the air will reach saturation. If the air continues to be lifted, there will be excess water vapor. If the temperature there is higher than 0℃, the excess water vapor will condense into small water droplets; If the temperature is lower than 0℃, excess water vapor will condense into small ice crystals. When these small water droplets and small ice crystals gradually increase to a level that can be recognized by human eyes, it is a cloud.
Question 5: What changes have taken place in the cloud and how did it form? It comes from the change of water, which is formed by the evaporation of water at high altitude and the condensation of cold air mass.
Question 6: How are clouds formed? The clouds in the sky are colorful and ever-changing. Some clouds often appear with some weather, so we can know the weather from them. We all have this experience in our daily life: the hanging wet clothes soon dry, and the wet ground soon dries, so where is the water? It turns out that they become water vapor after being irradiated by the sun and evaporate into the air. At high altitude, when the temperature drops, water vapor condenses into small water droplets or small ice crystals, and then gathers with dust in the atmosphere to form various clouds. These small water droplets or ice crystals in the cloud are very small and can be supported by the updraft in the air, so they float in the air one by one and become clouds. So there are three basic conditions for forming clouds: (1) sufficient water vapor; (2) There are enough condensation nuclei (solid particles in the atmosphere); (3) There should be a cooling process to condense the water vapor in the air, that is, the air with hot and humid rise. The formation of different clouds in the atmosphere is mainly caused by different forms of updraft. According to the characteristics of updraft forming clouds, clouds can be divided into three categories. The first is cumulus clouds. It is formed by hot air rising vertically to a certain height (condensation height) to condense water vapor in the air (as shown above). In summer, the ground is radiated by the sun, and the ground temperature rises, further heating the air layer near the ground. Due to the unevenness of the ground, the air in some places is hot and the air in some places is humid, so air masses with different sizes, surrounding temperatures, humidity and densities are generated in the air layer near the ground. The larger air mass rises at a higher height, and when it reaches above the condensation height, light cumulus clouds are formed. From the appearance, light cumulus clouds are isolated, scattered, flat on the bottom and convex on the top, and blue sky is often exposed between clouds. When the rising air mass is much higher than the condensation height, the cloud mass becomes tall and bloated, and the top is like cauliflower, indicating that cumulus clouds have formed. At this time, the cloud top has extended to a height below 0℃, and the cloud top is composed of supercooled water droplets, and its bottom is still composed of water droplets. When the air mass rises to a height higher than that of cumulus, the cloud top of cumulus can extend further upward. Generally speaking, when the temperature rises below-15℃, the supercooled water droplets at the cloud top will gradually freeze into ice crystals, making the cloud top gradually disappear with its clear arc outline and wispy structure. At this time, cumulonimbus clouds will develop into cumulonimbus clouds. Cumulus clouds have obvious diurnal variation. Usually, the morning is mostly light cumulus clouds; With the continuous enhancement, it gradually developed into cumulus clouds; It is most vigorous in the afternoon and can often develop into cumulonimbus clouds; In the evening, the cumulonimbus clouds gradually disappeared. If there are only faint cumulus clouds in the afternoon, it means that the air is relatively stable, cumulus clouds can no longer develop and grow, and the weather is better. If there are cumulonimbus clouds in the morning, it means that the air is already very unstable and it is likely to develop into cumulonimbus clouds. Therefore, the clouds are thick in the morning and there are signs of thunderstorms. The second category is layered clouds. It is formed by the sliding or lifting of the whole layer of air. They fill the sky like curtains. This cloud is most common at the interface where warm air climbs along the upper part of cold air (as shown on the previous page). The bottom of the cloud is consistent with the intersection of cold and warm air, and the top of the cloud is approximately horizontal. The thickness of the cloud varies greatly in different parts of the slope. Cirrus clouds and cirrostratus are in front, with the thinnest thickness, and the clouds are composed of ice crystals. Located in the middle is a high-level cloud with a thickness of 1000-3000m. Clouds are mostly composed of ice crystals, and the main part is mostly composed of ice crystals and supercooled water droplets. Finally, the nimbostratus, which is 3000-6000m thick, consists of ice crystals at the top, supercooled water droplets and ice crystals in the middle and water droplets at the bottom. Cirrostratus usually appears in front of stratiform clouds, and its appearance is often accompanied by solar and lunar halos. Therefore, if you see the sky dizzy and know that cirrostratus is moving, nimbostratus will move in the future, and the weather may turn rainy. "It rains at night when the sun is dizzy, and it is windy at noon when the moon is dizzy" refers to this constellation. The third category is the waves turning over the clouds. It is formed by atmospheric fluctuations. When the air rises at the peak, it becomes a cloud, and when the air sinks at the trough, no cloud is formed (as shown in the left picture). It includes cirrocumulus, altocumulus and stratocumulus. They are shaped like fish scales and their tops are like tiles. The thickness of the wave cloud is not large. When it appears, it often means that the gas layer is relatively stable and the weather changes little. There are also some sayings, such as "Wayun will kill people" and "There are carp spots in the sky, so there is no need to turn over the grain tomorrow". Different clouds are not isolated. Due to the change of conditions, they can develop or dissipate, and they can also be transformed into each other. In short, the emergence, development and evolution of clouds are complex and regular.
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Question 7: How are clouds formed? Definition of cloud technology terms
Chinese name: cloud English name: cloud definition: water droplets, ice crystals or their mixture are suspended in the air without touching the ground. Applied discipline: atmospheric science (first-class discipline); Atmosphere (two disciplines) This content is approved and published by the National Committee for the Examination and Approval of Scientific and Technical Terminology.
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Clouds are water droplets or ice crystal colloids left in the atmosphere. Clouds are the tangible result of the huge water cycle on the earth. The sun shines on the surface of the earth, and water evaporates to form water vapor. Once the water vapor is supersaturated, water molecules will gather around the dust (condensation nucleus) in the air, and the generated water droplets or ice crystals will scatter sunlight in all directions, thus creating the appearance of clouds.
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Kangxi dictionary
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Genetic classification of cloud classification table
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Clouds and weather
Clouds and climate
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Yun surnamed Cheng Jinyun.
The origin of cloud surname
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Tang poetry
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Cloud concept cloud computing
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Kangxi dictionary
region
Genetic classification of cloud classification table
Morphological classification
Clouds and weather
Clouds and climate
colour
Yun surnamed Cheng Jinyun.
The origin of cloud surname
Basic information of movies
loan
Production and sales
Release date?
abstract
Behind the scenes production
Bonus; prize
Tang poetry
Basic information
original work
Make an appreciative comment
Cloud concept cloud computing
Cloud Storage
cloud security
Brief introduction of seismic clouds
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Yun Yun
Putonghua Pinyin: yún Hainan Dialect Pinyin: wunz ◎ Spoken language, quoted as Ren ~ Yi ~. Confucius said poetry. ~ ~ (so, so; When quoting a sentence or dialogue, it means ending or omitting. ◎ At the end of the first sentence, use classical Chinese auxiliary words: ~ Who thinks? Years old ~ dusk, trying to remember when ~. ◎ Water vapor rises when it is cold and condenses into tiny water droplets, floating in the air in groups: marching into flowing water. ~ The steaming Xia Wei. ◎ Refers to "Yunnan Province" in China: ~ leg (ham produced in Yunnan Province). ~ cigarettes (cigarettes produced in Yunnan province).
Clouds in the sky 1(20 pieces) ◎ Zheng code: BDZS, u: 4e9 1,: D4C ◎ number of strokes: 4, radical: 2, stroke sequence number: 1 15.
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(1) (according to the script. Got it. The traditional word "cloud" comes from rain and clouds. "Rain" refers to fog in the sky. The word "cloud" is from the second to the last. "Two" means "again" and "again". "Er" means "myself". "Er" and "Mo" together mean "copying itself" and "copying itself". The combination of "rain" and "cloud" means that "fog in the sky" reproduces itself and expands its volume. Original meaning: the fog in the sky gathers in the way of "floating → collision → rotation". Extended meaning: fog in the sky. Note: The word "cloud" is not included in Shuowen, and the pocket edition of Chinese Dictionary is listed on page 168. This is a word that has existed since ancient times, and its sound and meaning are the same as the word from rain to cloud. Now it is used as a simplified word for the latter. Link: 1. Yin and yang are yin, and the archaic writing "Zi Bao Henceforth" means "(Qi) rotates and recombines face to face", which is the corresponding word of the archaic "Yang" meaning "(Qi) diverges". 2. The word "fertility" is from the cloud to the flesh, and "cloud" means "self-replication", "self-replication" and "self-reproduction". "Meat" refers to "meat" and "body". The combination of "cloud" and "meat" is "self-replication of the body". 3. The Taoist History and other documents record the surname of Nu Wa Yun (from rain to cloud). Nu Wa's cloud surname comes from the universe model of "Gaitian". The "Gaitian" universe model is essentially a typhoon model. Typhoon is divided into typhoon eye, cloud wall area and gale area from inside to outside in anatomical structure. These three areas correspond to the deserts in Gansu, Shaanxi and eastern Shaanxi respectively. Therefore, the indigenous tribes in Shaanxi all take "cloud" as their local symbol. "The History of Taoism" quoted Chang 'an as saying: "There is a land of Nuwa in Mount Li", and it says: "There is a valley of Nuwa in the north of Lantian Valley, where Huang San once lived, that is, Mount Li." It can be seen that Nuwa is from Shaanxi. The Yellow Emperor is also from Shaanxi. Historical records? The Chronicle of the Five Emperors says that the officials of the Yellow Emperor "all live on clouds" and the army is called "the master of clouds"; [Justice]: "The Yellow Emperor, ... also called Jinyun". "Xieji" quoted Ying Shao: "The Yellow Emperor was ordered to have Yun Rui, so he recorded it in the cloud. Spring official, Qingyun, Xia official, Jin ... >>