What does the cloud represent?

Abbreviation of Yugoslav currency name

Single element Chinese characters

1. Okay

2. Cloud

1 region

The abbreviation of Yunnan province

Because it is south of Yunling, it is named Yunnan. Yunnan County was established in the Western Han Dynasty. Yunnan County was founded in the Shu and Han Dynasties of the Three Kingdoms. Yunnan Province was founded in the Yuan Dynasty. Yunnan Ministry of Foreign Affairs will be established tomorrow. Clear Yunnan province.

Take the word "cloud" in the full name as the abbreviation.

2. Natural science

We are no strangers to clouds. White in sunny days and black in rainy days are called clouds. They make the sky unpredictable. People often see that the sky is sometimes blue and cloudless, sometimes white clouds are blooming, and sometimes dark clouds are gathering. Why sometimes there are clouds in the sky and sometimes there are no clouds? How are clouds formed? What is it made of?

Clouds floating in the sky are composed 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.

More than ten kilometers from the ground, the closer to the ground, the higher the temperature 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 it will evaporate (vaporize) and then condense (condense) and drop. 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.

thundercloud

People usually call lightning clouds Lei Yun. In fact, several kinds of clouds are related to lightning, such as stratocumulus, nimbostratus, cumulonimbus, cumulonimbus, and the most important one is cumulonimbus. Lei Yun in general professional books refers to cumulonimbus clouds.

The process of cloud formation is a process in which water vapor in the air reaches saturation or supersaturation through various reasons and condenses. Water vapor saturation in the air is a necessary condition for cloud formation. The main ways are as follows:

(1) The water vapor content is unchanged, and the air is cooled;

(2) keeping the temperature constant and increasing the water vapor content;

(3) Not only the water vapor content is increased, but also the temperature is reduced.

But for the formation of clouds, the cooling process is the most important process. In the process of cooling, the cooling effect brought by ascending movement is the most common.

Cumulonimbus cloud is a kind of cloud formed in the process of strong vertical convection. Because the ground absorbs much more solar radiation heat than the air layer, the ground temperature rises more during the day, especially in summer. Therefore, due to heat conduction and heat radiation, the atmospheric temperature near the ground rises, the gas temperature inevitably expands, the density decreases, and the pressure also decreases. According to the principle of mechanics, it will rise, and the density of the air layer above it is relatively high, and it will sink. In the rising process, the hot airflow expands and depressurizes, and at the same time, it exchanges heat with the high-altitude low-temperature air, so the water vapor in the rising air mass condenses, and water droplets appear, forming clouds. In the process of strong convection, the fog droplets in the cloud further cool down and become supercooled water droplets, ice crystals or snowflakes, and gradually increase with the height. At the freezing height (-10℃), due to the latent heat released by the freezing of supercooled water, the cloud top suddenly develops upward and spreads horizontally near the tropopause, forming a cloud anvil, which is a remarkable feature of cumulonimbus clouds.

In the process of cumulonimbus cloud formation, positive and negative charges are accumulated in different parts of the cloud under the simultaneous action of atmospheric electric field, temperature difference electrification effect and debris electrification effect. When the charge accumulates to a certain extent, it will discharge between clouds or between clouds and the ground, which is what people usually call "lightning".

Lightning has brought great disasters to human society with its great destructive power, especially in recent years, lightning disasters have occurred frequently, and the harm to the national economy has become increasingly serious. It is necessary to strengthen the awareness of lightning protection, actively cooperate with meteorological departments, do a good job of prevention, and minimize the losses caused by lightning.

3. Last name

Yun's family inherited Jinyun, and looked at Lang to rest in Henan.

The origin of Yun surname is closely related to the kindling that human beings end their barbaric life.

"The History of Taoism" says: "Zhuan Xu's surname is Yun."

"Examination of Surnames" records: "After Jinyun's home, I look at evil spirits, Henan."

Zhuan Xu is the grandson of the Yellow Emperor blessed by the Chinese nation. He once ruled the world for 78 years. His descendants have a wide range of reproduction and are the most important members of the Chinese nation. Among them, one of his descendants had the original surname, but Yun was separated from it, and Yun's surname was simply the descendant of Zhuan Xu.

The surname "Cloud" comes from the later. How can it be associated with "Fire"? As long as you look at the records about the origin of ピ surname in Shuowen, it is not difficult to see the answer to this question at a glance. Shuowen said, "The surname is after Zhu Rong." Everyone knows that "Zhu Rong" is synonymous with "fire".

The origin of Yun surname can be traced back to more than 4,000 years ago, and having such an outstanding ancestor "Zhu Rong" is not the proudest thing for Yun surname people!

As for the ancestor Jinyun mentioned in Textual Research on Surnames, according to textual research, he lived in the Yellow Emperor before Zhu Rong, and also took the official as his surname. Jinyun is the official name of the Yellow Emperor era. The Yellow Emperor took the cloud as the official name and managed the affairs throughout the year. The official name of Xia Guan was Jinyun. At that time, the name of Guan Xia's Jinyun was unknown, but his descendants took the word Jinyun as their surname, which was later handed down and then omitted as a cloud word, giving China this surname for five thousand years.

In history, people named Yun never played a noticeable role, but they also produced several famous figures in later generations. For example, the Sui Dynasty was famous for its good tools, but later it got tired of Genting's line and became a general. And Yun Biao, a Buddhist master who gave lectures in Zhang Yu, Jiangxi Province at the end of the Tang Dynasty, are well-known figures in Historical Records. Yun Jinglong, the magistrate of Cizhou in Song Dynasty, was an outstanding example of a good official.

Yun Jinglong is an official. It is said that politics is clear, and it advocates learning to persuade farmers, using it with caution, and loving the king as his own son. What is more commendable is that he has always been unyielding, so his popularity has returned. When he left office, people saw him off in tears, which showed how successful he was as a parent.