Why are there clouds in the sky? 5. Why are there clouds in the sky?

The water in the ocean, lakes, plant surfaces, and soil evaporates all the time, turning into water vapor and entering the atmosphere. Moist air containing water vapor rises upwards for some reason. During the ascent process, as the surrounding air becomes thinner and thinner, the air pressure becomes lower and lower, and the volume of the rising air expands.

When it expands, it dissipates its own heat, so the temperature of the rising air decreases. When the temperature decreases, the ability to contain water vapor becomes smaller and smaller, the saturated water vapor pressure decreases, the water vapor in the rising air quickly reaches a saturated state, and the temperature decreases again, and the excess water vapor attaches to the condensation nucleus suspended in the air and becomes small water droplets. If the temperature is lower than 0, the excess water vapor condenses into ice crystals or supercooled water droplets.

They are gathered together, supported by updrafts, and float in the air as clouds that we can see.

The water on the ground evaporates and floats to the sky, where it condenses into water vapor.

Because the water vaporizes into the sky and colds to form an air mass, this air mass is a cloud.

It's too cold in winter. People have too much gas, and they fly into the sky and become clouds! Right!

Clouds are actually small particles of water, which are evaporated by the sun.

That's not clouds, it's the atmosphere, to be exact.

Water vapor appears when cold liquefied.

It is a small droplet of water formed by the liquefaction of the true qi of water.

for there is water on the earth. Thank you.

That's not a cloud, it's the atmosphere, look at the 100,000 whys.

In this way, you can laugh at the clouds.

1. The clouds in the sky are like white sheep, like rolling mountains, like galloping horses, like mighty lions, like churning waves, like piled cotton wool, like shining fish scales.

2. A faint cloud, like a white feather, gently floats in the air.

3. The clouds in summer are like tourists, floating in the clear sky.

4. The sky there is always so blue and translucent, like a sapphire washed with clean water.

The same. 5. The white clouds, floating, floating, slowly being torn into wisps by the wind, and then gradually melted into the blue sky.

6. Pieces of white clouds are like white sails, floating in the blue sky.

7. In the sky, there are a few milky white clouds floating, like small white sails on the calm sea.

8. The sky is like a blue sea, the clouds are like a light boat, and the white clouds are drifting quietly and gently.

9. The wind gathered the dark clouds, like driving countless black wild horses, raging and surging in the heavenly pool. Heaven and earth are tightly pulled together as if they were being pulled together by rolling dark clouds.

10. The top of the snow peak, the clouds and mist are swirling, if you meet by chance, for a moment, the clouds open and the fog disperses, only to see the sea ......of clouds rolling under your feet, and the top of the mountain is like floating and sinking in the surging white waves

11. The clouds in the sky are varied and changing; If you don't pay attention, it changes, so you can't find it; It moves slowly, sometimes like a rushing wave, sometimes like a gentle feather, sometimes like shiny scales, sometimes like a crocodile ...... with its mouth wide open

12. The white clouds gradually rose from the valley, accumulating thicker and thicker, and suddenly became like an ocean.

One piece, suddenly like the earth paving, suddenly like a valley pile of snow. This cloudy silver sea, as if far away in the sky, and as if close at hand, light and spreading, paving and arranging, varied, interesting. Jade Mountain.

The peak of the peak, faintly cloudy, white clouds or scattered or clustered, ever-changing, sometimes gathered into a group, more and more out of the stream, drifting uncertainly, like a waterfall, called "cloud waterfall".

13. The clouds of the hometown.

It's beautiful. Sometimes it's as thin as a veil, sometimes it's as thick as a quilt; Sometimes they are scattered into pieces, sometimes they are clustered into hills. The clouds in my hometown are very cute. Sometimes like a little white rabbit.

jumping and jumping, as if racing against someone; Sometimes it looks like a big black elephant, with water in its nose, and sprinkles it down with "bang, bang"; Sometimes like a cat, sleeping lazily and indifferent to things outside. Sometimes the clouds would get together again, as if whispering.

There will be clouds in the sky because of the process of cooling and condensation of water vapor in the atmosphere.

1. Evaporation. The heat of the sun causes water on Earth, such as oceans, lakes, and rivers, to evaporate into water vapor. Water vapor is an unseen gas state of the water foreword.

2. Rising air.

Warm air rises, and by ascending, it encounters colder air and gradually cools as the altitude increases.

3. Cooling and condensation.

When the water vapor cools to a certain point, it condenses into very small drops of water or ice crystals. These water droplets or ice crystals form tiny water droplets or ice crystals that form clouds around tiny particles in the air (such as dust, salt particles, etc.).

4. Cloud formation.

When a large number of condensed water droplets or ice crystals come together, visible clouds are formed. Clouds come in different shapes, heights, and types, such as cirrus, cumulus, and stratus, among others.

Clouds are formed when water vapor in the atmosphere cools, condenses, and gathers together. Clouds are a beautiful and magical phenomenon in nature, and at the same time one of the important indicators of weather conditions.

Common types of clouds

1. Cumulus clouds, white, fluffy, and stacked clouds, shaped like cotton balls or fountains, are commonly found in clear skies. They usually indicate good weather, but can also develop into thunderstorm clouds at times.

2. Altocumulus, white or gray clouds, showing undulating waves or washing. They are located in the mid-layer atmosphere and usually have no precipitation, but can mean changes in the weather.

3. Stratus clouds, continuous gray clouds in the low-altitude layer, usually formed under a wide range of water vapor saturation conditions. They are wide, uniform clouds that often bring cloudy skies, light precipitation, or mist.

4. Cirrus, elongated, fibrous clouds in the upper layer, usually white or pale blue. They represent stable weather conditions at high altitudes and indicate the possibility of changes in the weather.

5. Cumulonimbus, large, vertical clouds, usually present a towering tower-like structure with a dark, thick base. They are thunderstorm clouds that are accompanied by lightning, thunder, heavy rainfall, and possible severe weather phenomena such as high winds, hail, etc.

Under the light, the evaporation of water surfaces and plant leaves such as rivers, rivers and oceans produces a large amount of water vapor. Affected by the temperature of the atmosphere below the boiling point of the water surface, the water vapor content changes greatly in the atmosphere, thus showing various forms, and clouds are one of these forms.

In the atmosphere from the ground upwards, the closer to the ground, the higher the temperature and the denser the air; Conversely, the higher you go, the cooler the temperature and the thinner the air. When water vapor enters the atmosphere, the thinner the air rises as the altitude increases, and the lower the air pressure, the rising water vapor expands due to the decrease in volume and the specific gravity increases.

Since the expansion of water vapor consumes its own heat, the temperature in the rising air decreases. As the temperature decreases, the ability of the atmosphere to hold water vapor becomes less and less. When the temperature drops to a certain level, the air is saturated with water vapor.

At this time, if the air continues to rise, excess water vapor will precipitate.

When the temperature in the atmosphere is higher than 0 during the rise of water vapor, the excess water vapor will condense into small water droplets. When the temperature is below 0, the excess water vapor is condensed into Xiaoice crystals.

When these small water droplets and Xiaoice crystals gradually increase and "come together" together to reach a certain number, a cloud is formed that can be seen through the naked eye.

In addition to the two basic conditions of sufficient water vapor and air cooling, there is also one of the most critical factors, which is "condensation nuclei".

If the air is free of any impurities and is absolutely pure, the water vapor molecules in the atmosphere cannot attach to the condensation nuclei.

The "adhesion" between individual water vapor molecules in the atmosphere is very small, and due to the limited ability to merge with each other, they are finally "together" together and then "separated". Even the small fraction of water vapor molecules that come together by eliminating all odds will be so small that the small droplets will evaporate rapidly. Therefore, their efforts can be described as "all the work they have done".

The atmosphere contains a large number of particles, typically dust, as well as a large number of tiny particles such as salt and smoke particles, which are called "condensation nuclei".

Condensation nuclei play a particularly critical role in the formation of clouds. It not only condenses and gathers a large amount of water vapor, but also makes them attach to itself.

As a result of the condensation nucleus, a large number of water vapor molecules that collide and join together are finally "agglomerate", and they "break into wholes" to form clouds of different sizes.

1. Gao Yun clan.

1. Cirrus clouds: It sometimes occurs at the highest altitude at which clouds can be generated, and the cloud base is generally between 4,500 and 10,000 meters. It is composed of fine ice Xiaoice crystals at high altitude, and the ice crystals are relatively sparse, so the clouds are relatively thin and transmit well, and the color is white and has the luster of ice crystals.

Cirrus is divided into four categories: Cirrus capillus, Cirrus uncinus, pseudoCirrus pseudocirrus and Cirrus dense according to its shape, structure and other characteristics.

2. Cirrocumulus cloud: The cloud is very small, white and shadowless, and is composed of white fine waves, scales or spherical small cloud patches or clouds, often arranged in rows or groups, much like small ripples caused by a light breeze blowing through the water surface. White with no shadow and a silky sheen.

The clouds are very thin, can penetrate the sun and moonlight, and are white without darkness, and at night they are gray-black, almost entirely composed of ice crystals.

3. Cirrostratus.

Second, the Zhongyun clan.

1. Altocumulus: the cloud is lumpy, flake or spherical; The clouds are sometimes scattered and isolated, sometimes clustered in clusters and arranged in rows, like ridges or waves; Patches are often white or gray in color, darker in the middle; The light transmission of each part of the cloud is different, and the thin part can see the outline of the sun and the moon, and sometimes the phenomenon of bloom and iridescence appears.

2. Altostratus: the cloud base is uniformly curtain-shaped, often with stripe structure and wisp structure, occasionally in the shape of a hanging ball, with a wide distribution range, often covering the whole sky, and the color is gray-white or gray-blue. When the clouds are thin, the contours of the sun and moon are blurred, such as a layer of ground glass, which is a translucent altostratus. When the clouds are thick, the position of the sun and moon cannot be seen at all, and it is a dark altostratus cloud.

3. Low cloud tribe.

1. Nimbostratus: low and thick and uniform precipitation clouds, dark gray. The horizontal distribution is wide, obscuring the entire sky, and the position of the sun and moon cannot be seen.

Nimbostratus clouds are formed by adiabatic cooling and condensation due to the slow uplift of warm and moist air by cold air when large weather systems such as fronts invade, and are composed of water droplets or water droplets and ice crystals, often producing continuous rain and snow.

2. Stratocumulus.

3. Stratus. Fourth, directly expand the cloud clan.

1. Cumulus clouds. 2. Cumulonimbus clouds.

5. Miscellaneous. Contrails are elongated, thin clouds that form when jetjets streak across the sky. Noctilucent clouds are very rare, they form in the middle layer of the atmosphere and can only be seen at high latitudes.

(i) Cirrus clouds.

Delicate and scattered, with fibrous tissue, like feathers, hair or ponytail, lonely in the air without clouds, orange or red at sunrise and sunset.

Cirrus clouds are one of the highest clouds, and the sun appears early in the morning before the horizon.

ii) Cirrostratus.

It is the tallest and whitest cloud curtain, and when the sun or moon is obscured, its outline can still be seen, and a halo often appears around it. Wherever there is a halo in the sky, there must be cirrocumulus clouds, but thick cirrocumulus clouds are pulled to the edge of the sky like a curtain.

iii) Cirrocumulus.

These clouds rarely appear, and occasionally they cover the whole day, which fishermen call mackerel days, because the sky seems to be covered with fish scales, and the individuals are small, white and cloudless, sometimes wavy. Cirrocumulus occurs mostly at the same time as cirrus or cirrostratus.

iv) Altostratus.

Most of the high-rise clouds are covered throughout the day, and when they gradually thicken and stool low, they make people feel gloomy. When it turns into a cumulus cloud, there is often a sparse low rainfall.

Conversely, Altocumulus is also formed by the elevation of Nimbostratus.

v) Altocumulus.

Altocumulus is larger than Cirrocumulus, ** cloudy, often connected, the bottom is wavy, or arranged in a long column, or intertwined into a checkerboard, and its style is many.

vi) Stratocumulus.

The individual is larger than Altocumulus, softer in appearance, and less pronounced in structure. If they are joined together, the bottom has a wavy pattern and shades of light and dark gray.

Stratocumulus clouds are mostly like giant rollers, and below the base of the cloud represents the troposphere. Most of the common sea of clouds in high mountains are Stratocumulus clouds.

vii) Stratus.

Stratus is a uniform grayish-white low cloud that resembles fog but does not meet the ground. When it is halfway up the mountainside, there is a downward posture at the edge, and when it reaches there, it is a thick fog.

viii) Nimbostratus.

It is a typical bad weather cloud, dark and amorphous, much like a broken cloud, which makes the sky therefore dark, and whatever is persistent and must have fallen in Nimbostratus clouds.

ix) Cumulus clouds.

It looks like a pile of cotton, with an uneven top and a bulge like a mound, cauliflower, or tower. When sunlight is obliquely shining, the light and dark sides of cumulus clouds are noticeable, if.

In the same direction as the sun, ** dark and particularly bright edges.

x) Cumulonimbus clouds.

It is the thickest and most massive cloud, stretching very high vertically, dark and indistinguishable at the base, towering like a mountain or a tower at the top, and often with anvil-like pseudocirrus, making a huge lupine sticking out, and when the cumulonimbus cloud is already at the zenith, there is about to be a heavy thunderstorm.